ci: Use script to determine apps to build, don't build if no apps changed (#183)

Co-authored-by: Steven Kreitzer <[email protected]>

Author: bjw-s

.github/workflows/release.yaml

@@ -39,20 +39,52 @@ jobs:
           dir_names_max_depth: "1"
           path: apps
 
+      - name: Setup Node
+        uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4.3.0
+
+      - name: Install required packages
+        run: npm install yaml
+
       - name: Extract Metadata
         id: apps
-        working-directory: apps
-        run: |
-          if [[ "${{ github.event_name }}" != "workflow_dispatch" ]]; then
-              apps="${{ steps.changed-dirs.outputs.all_changed_and_modified_files }}"
-          else
-              apps="${{ inputs.app }}"
-          fi
-          apps=$(printf "%s/metadata.yaml\n" ${apps})
-          apps=$(yq eval-all --indent=0 --output-format=json "[.]" ${apps})
-          echo "apps=${apps}" >> $GITHUB_OUTPUT
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          script: |
+            const fs = require('fs');
+            const yaml = require('yaml');
+            const cwd = process.cwd();
+
+            let input = '';
+            if (context.eventName == 'workflow_dispatch') {
+              input = '${{ inputs.app }}';
+            } else {
+              input = '${{ steps.changed-dirs.outputs.all_changed_and_modified_files }}';
+            }
+
+            appsToBuild = input.split(' ').filter((v) => v !== '');
+
+            let output = [];
+            appsToBuild.forEach(function(app) {
+              const metadataPath = `${cwd}/apps/${app}/metadata.yaml`;
+              if (!fs.existsSync(metadataPath)) {
+                core.setFailed(`App ${app} does not have a metadata.yaml`);
+                process.exit(1);
+              }
+
+              metadataContent = fs.readFileSync(metadataPath, {encoding: "utf8"});
+              metadata = yaml.parse(metadataContent);
+
+              output.push(metadata);
+            });
+
+            core.setOutput('apps', output);
+
+            console.log('apps:');
+            console.log(JSON.stringify(output, null, 2));
+            core.summary.addHeading('Apps to build:').addList(appsToBuild).write()
 
   build:
+    if: ${{ needs.changed.outputs.apps != '[]' }}
     needs: changed
     name: Build ${{ matrix.app.name }}
     uses: ./.github/workflows/image-build-action.yaml
@@ -70,7 +102,7 @@ jobs:
       release: ${{ github.event_name == 'workflow_dispatch' && inputs.release || github.event_name == 'push' }}
 
   status:
-    if: ${{ always() }}
+    if: ${{ !cancelled() }}
     needs: build
     name: Build Success
     runs-on: ubuntu-latest