Streamline CI (pantsbuild#17224)

- Unifies the code that generates the "Build wheels" jobs, so they are now uniform (with allowances for the containerization on Linux). This means in particular that we no longer bootstrap Pants on macOS11 on ARM64, as there was no particular reason to, and we weren't doing so on macOS10.15 on x86 for example.
- Uses the new classifier to skip these jobs entirely if unneeded.
- Similarly, uses the new classifier to skip rust steps if unneeded.
- Removes the steps for getting the commit message, since we no longer need it.

Now, to force a rust or wheel build even if no files were affected, you can temporarily modify a relevant file. If this becomes a hassle we can think of another way to achieve this, that doesn't involve the commit message.

.github/workflows/audit.yaml

@@ -12,24 +12,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Cargo audit (for security vulnerabilities)
       run: './cargo install --version 0.16.0 cargo-audit
 

.github/workflows/cache_comparison.yaml

@@ -11,24 +11,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - if: github.event_name != 'pull_request'
       name: Setup toolchain auth
       run: 'echo TOOLCHAIN_AUTH_TOKEN="${{ secrets.TOOLCHAIN_AUTH_TOKEN }}" >> $GITHUB_ENV

.github/workflows/test-cron.yaml

@@ -20,24 +20,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with:
@@ -124,7 +106,7 @@ jobs:
       run: './pants run build-support/bin/generate_github_workflows.py -- --check
 
         '
-    - if: '!contains(env.COMMIT_MESSAGE, ''[ci skip-rust]'')'
+    - if: needs.classify_changes.outputs.rust == 'true'
       name: Test and lint Rust
       run: 'sudo apt-get install -y pkg-config fuse libfuse-dev
 
@@ -154,24 +136,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with:
@@ -256,7 +220,7 @@ jobs:
           src/python/pants/engine/internals/native_engine.so.metadata'
     - env:
         TMPDIR: ${{ runner.temp }}
-      if: '!contains(env.COMMIT_MESSAGE, ''[ci skip-rust]'')'
+      if: needs.classify_changes.outputs.rust == 'true'
       name: Test Rust
       run: ./cargo test --tests -- --nocapture
     strategy:
@@ -292,24 +256,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with:
@@ -358,24 +304,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Install AdoptJDK
       uses: actions/setup-java@v3
       with:
@@ -447,24 +375,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Install AdoptJDK
       uses: actions/setup-java@v3
       with:
@@ -536,24 +446,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Install AdoptJDK
       uses: actions/setup-java@v3
       with:
@@ -627,24 +519,6 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 10
-    - if: github.event_name == 'push'
-      name: Get commit message for branch builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
-    - if: github.event_name == 'pull_request'
-      name: Get commit message for PR builds
-      run: 'echo "COMMIT_MESSAGE<<EOF" >> $GITHUB_ENV
-
-        echo "$(git log --format=%B -n 1 HEAD^2)" >> $GITHUB_ENV
-
-        echo "EOF" >> $GITHUB_ENV
-
-        '
     - name: Install AdoptJDK
       uses: actions/setup-java@v3
       with: