feat: add Firebase Storage Emulator setup and teardown actions

- Create firebase.json configuration for Storage Emulator on port 9199
- Add setup-firebase-emulator action to install and start Firebase CLI emulator
- Add teardown-firebase-emulator action to stop emulator using saved PID
- Use proper PID-based process management instead of pkill/killall

Co-authored-by: rchincha <45800463+rchincha@users.noreply.github.com>

.github/actions/setup-firebase-emulator/action.yaml

@@ -0,0 +1,38 @@
+name: 'Setup Firebase Storage Emulator'
+description: 'Install and run Firebase Storage Emulator for GCS testing'
+runs:
+  using: "composite"
+  steps:
+    - name: Install Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+    
+    - name: Install Firebase CLI
+      shell: bash
+      run: |
+        npm install -g firebase-tools
+    
+    - name: Start Firebase Storage Emulator
+      shell: bash
+      run: |
+        cd ${{ github.workspace }}
+        # Start emulator in the background and save PID
+        firebase emulators:start --only storage --project demo-test > /tmp/firebase-emulator.log 2>&1 &
+        FIREBASE_PID=$!
+        echo $FIREBASE_PID > ${{ github.workspace }}/.firebase-emulator.pid
+        echo "Firebase emulator started with PID: $FIREBASE_PID"
+        
+        # Wait for emulator to be ready
+        echo "Waiting for Firebase Storage Emulator to be ready..."
+        for i in {1..30}; do
+          if curl -s http://localhost:9199 > /dev/null 2>&1; then
+            echo "Firebase Storage Emulator is ready"
+            exit 0
+          fi
+          sleep 1
+        done
+        
+        echo "Firebase Storage Emulator failed to start within 30 seconds"
+        cat /tmp/firebase-emulator.log
+        exit 1

.github/actions/teardown-firebase-emulator/action.yaml

@@ -0,0 +1,23 @@
+name: 'Teardown Firebase Storage Emulator'
+description: 'Stop Firebase Storage Emulator'
+runs:
+  using: "composite"
+  steps:
+    - if: always()
+      shell: bash
+      run: |
+        # Save the PID file location
+        PID_FILE="${{ github.workspace }}/.firebase-emulator.pid"
+        if [ -f "$PID_FILE" ]; then
+          PID=$(cat "$PID_FILE")
+          if [ -n "$PID" ] && kill -0 "$PID" 2>/dev/null; then
+            kill "$PID" || true
+            # Wait a bit for graceful shutdown
+            sleep 2
+            # Force kill if still running
+            if kill -0 "$PID" 2>/dev/null; then
+              kill -9 "$PID" || true
+            fi
+          fi
+          rm -f "$PID_FILE"
+        fi

firebase.json

@@ -0,0 +1,8 @@
+{
+  "emulators": {
+    "storage": {
+      "host": "0.0.0.0",
+      "port": 9199
+    }
+  }
+}