feat: replace deprecated Firebase token with service account authentication

- Update deploy-staging.yml to use FIREBASE_SERVICE_ACCOUNT_STAGING
- Update deploy-prod.yml to use FIREBASE_SERVICE_ACCOUNT_PROD
- Remove deprecated --token authentication method
- Implement GOOGLE_APPLICATION_CREDENTIALS for secure authentication

Author: MrCoder

.github/workflows/deploy-prod.yml

@@ -30,8 +30,16 @@ jobs:
           cache: 'pnpm'
       - run: pnpm install && pnpm build
       - run: pnpm release
-      - run: cd functions && pnpm install && pnpm deploy:config:prod --token ${{ secrets.FIREBASE_TOKEN }}
-      - run: pnpm deploy:prod --token ${{ secrets.FIREBASE_TOKEN }}
+      - name: Setup Firebase service account
+        run: |
+          echo '${{ secrets.FIREBASE_SERVICE_ACCOUNT_PROD }}' > /tmp/gcp-key.json
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+      - run: |
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+          cd functions && pnpm install && pnpm deploy:config:prod
+      - run: |
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+          pnpm deploy:prod
       - name: Upload Release Asset
         id: upload-release-asset
         uses: shogo82148/actions-upload-release-asset@v1

.github/workflows/deploy-staging.yml

@@ -26,10 +26,18 @@ jobs:
           cache: 'pnpm'
       - run: pnpm install && pnpm build
       - run: pnpm release
-      - run: cd functions && pnpm install && pnpm deploy:config:staging --token ${{ secrets.FIREBASE_TOKEN }}
+      - name: Setup Firebase service account
+        run: |
+          echo '${{ secrets.FIREBASE_SERVICE_ACCOUNT_STAGING }}' > /tmp/gcp-key.json
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+      - run: |
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+          cd functions && pnpm install && pnpm deploy:config:staging
       - name: Deploy to staging
         if: github.actor != 'dependabot[bot]' && github.actor != 'dependabot-preview[bot]' # This conditional will skip the step for Dependabot PRs
-        run: pnpm deploy:staging --token ${{ secrets.FIREBASE_TOKEN }}
+        run: |
+          export GOOGLE_APPLICATION_CREDENTIALS=/tmp/gcp-key.json
+          pnpm deploy:staging
       - name: Upload artifacts # Find artifacts under actions/jobs
         uses: actions/upload-artifact@v4
         with: