Automatically run integration test on PR merge (#1182)

Setup Github Workflow to automatically run integration test on commits to master branch.

The test can be triggered manually by visiting https://github.com/firebase/firebase-functions/actions/workflows/postmerge.yaml. You can also manually trigger the test via:

```
GCLOUD_PROJECT=<my project> npm run test:postmerge
```

Make sure your test project has all necessary resources enambled (i.e. enable Firestore, Storage, RTDB, Auth, etc.)

Only one test can run at a time, so I've enforced/disabled concurrency on the workflow.

.github/workflows/postmerge.yaml

@@ -0,0 +1,55 @@
+# Copyright 2022 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+name: Post-merge tests
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: ['CI Tests']
+    types: [completed]
+    branches: [master]
+
+concurrency:
+  group: postmerge-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CI: true
+
+jobs:
+  postmerge:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
+      - uses: google-github-actions/auth@v0
+        with:
+          credentials_json: '${{ secrets.CF3_INTEGRATION_TEST_GOOGLE_CREDENTIALS }}'
+          create_credentials_file: true
+
+      - name: 'Set up Cloud SDK'
+        uses: google-github-actions/setup-gcloud@v0
+
+      - name: 'Setup Firebase CLI'
+        run: npm i -g firebase-tools
+
+      - name: 'Run integration test'
+        run: npm run test:postmerge
+
+      - name: Print debug logs
+        if: failure()
+        run: find . -type f -name "*debug.log" | xargs cat

integration_test/run_tests.sh

@@ -3,26 +3,14 @@
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
-function usage {
-  echo "Usage: ${0} <project_id> [<token>]"
-  exit 1
-}
+PROJECT_ID="${GCLOUD_PROJECT}"
+TIMESTAMP=$(date +%s)
 
-# This script takes in one required argument specifying a project_id and an
-# optional arguement for a CI token that can be obtained by running
-# `firebase login:ci`
-# Example usage (from root dir) without token:
-# ./integration_test/run_tests.sh chenky-test-proj
-# Example usage (from root dir) with token:
-# ./integration_test/run_tests.sh chenky-test-proj $TOKEN
-if [[ "${1}" == "" ]]; then
-  usage
+if [[ "${PROJECT_ID}" == "" ]]; then
+  echo "process.env.GCLOUD_PROJECT cannot be empty"
+  exit 1
 fi
 
-PROJECT_ID="${1}"
-TIMESTAMP=$(date +%s)
-TOKEN="${2}"
-
 # Directory where this script lives.
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
@@ -64,22 +52,14 @@ function delete_all_functions {
   cd "${DIR}"
   # Try to delete, if there are errors it is because the project is already empty,
   # in that case do nothing.
-  if [[ "${TOKEN}" == "" ]]; then
-    firebase functions:delete integrationTests v1 v2 --force --project=$PROJECT_ID || : &
-  else
-    firebase functions:delete integrationTests v1 v2 --force --project=$PROJECT_ID --token=$TOKEN || : &
-  fi
+  firebase functions:delete integrationTests v1 v2 --force --project=$PROJECT_ID || : &
   wait
   announce "Project emptied."
 }
 
 function deploy {
   # Deploy functions, and security rules for database and Firestore. If the deploy fails, retry twice
-  if [[ "${TOKEN}" == "" ]]; then
-    for i in 1 2 3; do firebase deploy --project="${PROJECT_ID}" --only functions,database,firestore && break; done
-  else
-    for i in 1 2 3; do firebase deploy --project="${PROJECT_ID}" --token="${TOKEN}" --only functions,database,firestore && break; done
-  fi
+  for i in 1 2; do firebase deploy --project="${PROJECT_ID}" --only functions,database,firestore && break; done
 }
 
 function run_tests {

package.json

@@ -178,7 +178,8 @@
     "lint": "tslint --config tslint.json --project tsconfig.json ",
     "lint:fix": "tslint --config tslint.json --fix --project tsconfig.json",
     "test": "mocha --file ./mocha/setup.ts \"spec/**/*.spec.ts\"",
-    "test:bin": "./scripts/bin-test/run.sh"
+    "test:bin": "./scripts/bin-test/run.sh",
+    "test:postmerge": "./integration_test/run_tests.sh"
   },
   "dependencies": {
     "@types/cors": "^2.8.5",