Parallelize CI build

CI was building packages one after another in a single VM. This is slow,
has the risk of one package affecting another and makes it harder to
figure out which job failed. This change adds a preparation job which
builds the image and gets the list of packages and changes build job
into matrix depending on the prepare job.

.github/workflows/ci.yml

@@ -18,8 +18,36 @@ env:
   EXECUTE_CMD: "$PODMAN_CMD exec -u $USER_NAME -i $CONTAINER_NAME"
 
 jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+            sources: ${{ steps.list-sources.outputs.sources }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build CADR Running Environment Image
+        run: |
+          sudo apt-get update
+          sudo apt-get upgrade podman
+          $PODMAN_CMD build -t $IMAGE_NAME .
+          $PODMAN_CMD save $IMAGE_NAME > CADR_image.tar
+      - name: Upload the Running Environment Image to Artifact
+        uses: actions/upload-artifact@v2
+        if: ${{ always() }}
+        with:
+          name: CADR_image
+          path: CADR_image.tar
+      - name: Install jq
+        run: sudo apt-get install -y jq
+      - name: List sources
+        id: list-sources
+        run: echo "::set-output name=sources::$(ls pkg_specs/*.sss | sed 's/\.sss$//' | jq -R -s -c 'split("\n")[:-1]')"
   build:
+    needs: prepare
+    if: ${{ success() }}
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        source: ${{ fromJson(needs.prepare.outputs.sources) }}
     steps:
       - uses: actions/checkout@v2
       - name: Setup CI Build Script
@@ -35,29 +63,17 @@ jobs:
           \$MKCMD all
           EOF
           chmod +x $CI_SCRIPT
-      - name: Build CADR Running Environment Image
-        run: |
-          sudo apt-get update
-          sudo apt-get upgrade podman
-          $PODMAN_CMD build -t $IMAGE_NAME .
-          $PODMAN_CMD save $IMAGE_NAME > CADR_image.tar
-      - name: Upload the Running Environment Image to Artifact
-        uses: actions/upload-artifact@v2
-        if: ${{ always() }}
-        with:
-          name: CADR_image
-          path: CADR_image.tar
       - name: Spawn Podman Container to Prepare Running Environment
         run: |
           eval $SPAWN_CONTAINER
       - name: Build CADR
         run: |
-          eval $EXECUTE_CMD ${BUILD_DIR}/$CI_SCRIPT
+          eval SOURCES=${{ matrix.source }} $EXECUTE_CMD ${BUILD_DIR}/$CI_SCRIPT
       - name: Upload Debian Packages Just Built to Artifact
         uses: actions/upload-artifact@v2
         if: ${{ always() }}
         with:
-          name: CADR_debs
+          name: ${{ $matrix.source }}
           path: build/*.deb
       - name: Check SHA256
         if: ${{ always() }}
@@ -81,7 +97,7 @@ jobs:
           sudo chown -R $USER $PWD
 
   test:
-    needs: build
+    needs: [build, prepare]
     if: ${{ success() }}
     runs-on: ubuntu-latest
     strategy:
@@ -120,10 +136,10 @@ jobs:
           $PODMAN_CMD load < CADR_image.tar
           mkdir build
       - name: Download Pre-built Debian Packages
-        uses: actions/download-artifact@v3
+        uses: thecodenebula/download-artifact@e9e49e9bbce8ff2b901957ee034714cab099644a
         with:
-          name: CADR_debs
-          path: build
+          names: ${{ fromJson(needs.prepare.outputs.sources) }}
+          paths: [build]
       - name: Test CADR Basic
         run: |
           eval $SPAWN_CONTAINER