[Infra] Add support for manual dispatch to new re-usable SPM workflow

.github/workflows/common.yml

@@ -56,41 +56,41 @@
           key: ${{ steps.generate_cache_key.outputs.cache_key }}
 
   spm:
-    # Don't run on private repo unless it is a PR.
-    if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
+    # Run on the main repo's scheduled jobs or pull requests and manual workflow invocations.
+    if: (github.repository == 'firebase/firebase-ios-sdk' && github.event_name == 'schedule') || contains(fromJSON('["pull_request", "workflow_dispatch"]'), github.event_name)
     needs: [spm-package-resolved]
     strategy:
       matrix:
         os: [macos-15]
         xcode: [Xcode_16.2]
         platform: [iOS, tvOS, macOS, watchOS, catalyst, visionOS]
         include:
           - os: macos-14
             xcode: Xcode_16.2
             platform: iOS
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: actions/cache/restore@v4
       with:
         path: .build
         key: ${{needs.spm-package-resolved.outputs.cache_key}}
     - name: Xcode
       run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
     - name: Install visionOS, if needed.
       if: matrix.platform == 'visionOS'
       run: xcodebuild -downloadPlatform visionOS
     - name: Initialize xcodebuild
       run: scripts/setup_spm_tests.sh
     - uses: nick-fields/retry@ce71cc2ab81d554ebbe88c79ab5975992d79ba08 # v3
       if: contains(join(inputs.platforms), matrix.platform) || matrix.os == 'macos-14'
       with:
         timeout_minutes: 120
         max_attempts: 3
         retry_on: error
         retry_wait_seconds: 120
         command: |
           ./scripts/build.sh \
             ${{ inputs.target }} \
             ${{ matrix.platform }} \
             ${{ (contains(inputs.buildonly_platforms, matrix.platform) || contains(inputs.buildonly_platforms, 'all')) && 'spmbuildonly' || 'spm' }}