Add workflows.

.github/config/grcov.yml

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+output-type: html

.github/workflows/main.yml

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+name: Main
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup enviroment
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+
+      - name: Cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-features --no-fail-fast
+        env:
+          CARGO_INCREMENTAL: '0'
+          RUSTFLAGS: '-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests'
+          RUSTDOCFLAGS: '-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests'
+
+      - name: Get grcov
+        id: coverage
+        uses: actions-rs/[email protected]
+        with:
+          config: .github/config/grcov.yml
+
+      - name: Copy coverage results
+        run: cp -R ${{ steps.coverage.outputs.report }} ./.github/reports
+
+      - name: Commit code coverage report
+        uses: EndBug/add-and-commit@v5
+        with:
+          author_name: Github actions
+          author_email: [email protected]
+          message: "Update report"
+          add: .github/reports/badges/plastic.svg
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

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+name: Test
+
+on:
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build
+        run: cargo build
+
+      - name: Run tests
+        run: cargo test --verbose