encode json as string

.github/workflows/build.yml

@@ -4,12 +4,12 @@ jobs:
   prepare-matrix:
     runs-on: ubuntu-latest
     outputs:
-      dist: ${{ steps.read-matrix.outputs.dist }}
+      dist: ${{ steps.read-matrix.outputs }}
     steps:
       - uses: actions/checkout@v3
       - name: read matrix.json
         id: read-matrix
-        run: cat matrix.json >> $GITHUB_OUTPUT
+        run: jq '@json' < matrix.json >> $GITHUB_OUTPUT
   build:
     runs-on: ubuntu-latest
     needs: [prepare-matrix]

matrix.json

@@ -1,16 +1,14 @@
-{
-    "dist" = [
-        {"OS": "alpine", "OS_VER": "3.17" },
-        {"OS": "alpine", "OS_VER": "3.18" },
-        {"OS": "alpine", "OS_VER": "edge" },
-        {"OS": "archlinux", "OS_VER": "latest" },
-        {"OS": "debian", "OS_VER": "bookworm" },
-        {"OS": "debian", "OS_VER": "bullseye" },
-        {"OS": "fedora", "OS_VER": "37" },
-        {"OS": "fedora", "OS_VER": "38" },
-        {"OS": "rockylinux", "OS_VER": "8" },
-        {"OS": "rockylinux", "OS_VER": "9" },
-        {"OS": "ubuntu", "OS_VER": "focal" },
-        {"OS": "ubuntu", "OS_VER": "jammy" }
-    ]
-}
+[
+    {"OS": "alpine", "OS_VER": "3.17" },
+    {"OS": "alpine", "OS_VER": "3.18" },
+    {"OS": "alpine", "OS_VER": "edge" },
+    {"OS": "archlinux", "OS_VER": "latest" },
+    {"OS": "debian", "OS_VER": "bookworm" },
+    {"OS": "debian", "OS_VER": "bullseye" },
+    {"OS": "fedora", "OS_VER": "37" },
+    {"OS": "fedora", "OS_VER": "38" },
+    {"OS": "rockylinux", "OS_VER": "8" },
+    {"OS": "rockylinux", "OS_VER": "9" },
+    {"OS": "ubuntu", "OS_VER": "focal" },
+    {"OS": "ubuntu", "OS_VER": "jammy" }
+]