fix: Optimize Firebase CI workflows with caching for firebase.json (#82)

- **Workflows Updated**:
  - **`delete-firebase-hosting-channel.yml`**:
    - Added caching for `firebase.json` using `actions/cache` to persist configuration across workflow runs.
    - Updated `actions/checkout` and `w9jds/firebase-action` to pinned versions for enhanced stability.
    - Conditional execution of Firebase actions based on cache availability.

  - **`firebase-hosting-pull-request.yml`**:
    - Implemented `actions/cache/save` to store `firebase.json` after build and test steps.
    - Updated workflow to ensure `firebase.json` is available for subsequent Firebase deployments.

- **Impact**:
  - Speeds up Firebase workflow executions by reducing redundant `firebase.json` generation.
  - Enhances workflow reliability with pinned dependencies and optimized caching.

Author: warnyul

.github/workflows/delete-firebase-hosting-channel.yml

@@ -8,8 +8,17 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Restore firebase.json
+        id: cache-restore-firebase-json
+        uses: actions/cache/restore@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        env:
+          cache-name: firebase
+        with:
+          path: firebase.json
+          key: ${{ github.head_ref }}
       - uses: w9jds/firebase-action@12e7dd1a31239567f9b4d398e6c1dc9f1c6fc70a # v13.28.0
+        if: steps.cache-restore-firebase-json.outputs.cache-hit == 'true'
         with:
           # Extracts the full channel name from the PR number and feeds it to the delete command
           args: hosting:channel:list | grep 'pr${{ github.event.pull_request.number }}' | cut --delimiter ' ' --fields 2 | xargs -I {} firebase hosting:channel:delete --force {}

.github/workflows/firebase-hosting-pull-request.yml

@@ -23,6 +23,13 @@ jobs:
           key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
       - name: Build and Test
         run: ./scripts/build.sh
+      - name: Save firebase.json
+        uses: actions/cache/save@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        env:
+          cache-name: firebase
+        with:
+          path: firebase.json
+          key: ${{ github.head_ref }}      
       - uses: FirebaseExtended/action-hosting-deploy@0cbcac4740c2bfb00d632f0b863b57713124eb5a # v0.9.0
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'