Improve prod workflow

- Use a separate job to test read-only cache
- Use dependency jobs to avoid cache race conditions

.github/workflows/prod.yml

@@ -7,7 +7,22 @@ on:
   workflow_dispatch:
 
 jobs:
+  basic-build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Build using Gradle wrapper
+      uses: ./
+      with:
+        build-root-directory: __tests__/samples/basic
+        arguments: test
+   
   gradle-execution:
+    needs: basic-build
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
@@ -18,11 +33,6 @@ jobs:
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2
-    - name: Test use Gradle wrapper
-      uses: ./
-      with:
-        build-root-directory: __tests__/samples/basic
-        arguments: test
     - name: Test use defined Gradle version
       uses: ./
       with:
@@ -49,6 +59,7 @@ jobs:
         arguments: help
 
   dependencies-cache:
+    needs: basic-build
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
@@ -62,15 +73,9 @@ jobs:
         build-root-directory: __tests__/samples/basic
         arguments: test --no-daemon
         dependencies-cache-enabled: true
-    - name: Test dependencies-cache-enabled
-      uses: ./
-      with:
-        build-root-directory: __tests__/samples/basic
-        arguments: test --no-daemon
-        dependencies-cache-enabled: true
-        cache-read-only: true
 
   configuration-cache:
+    needs: basic-build
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
@@ -87,8 +92,26 @@ jobs:
         dependencies-cache-enabled: true 
         # Configuration cache requires dependencies cache, since it assumes dependencies are already downloaded.
 
+  cache-read-only:
+    needs: basic-build
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Test cache-read-only
+      uses: ./
+      with:
+        build-root-directory: __tests__/samples/basic
+        arguments: test --no-daemon
+        dependencies-cache-enabled: true
+        configuration-cache-enabled: true
+        cache-read-only: true
 
   failures: # These build invocations are informational only, and are expected to fail
+    needs: basic-build
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources