add aggregate workflow for CI

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run daily at 01:34, so we get notified if CI is broken before a pull request
+    # is submitted.
+    - cron: "34 1 * * *"
+
+permissions:
+  contents: read
+  pull-requests: read
+  checks: write
+
+jobs:
+  lint:
+    uses: ./.github/workflows/lint.yml
+  test:
+    uses: ./.github/workflows/test.yml

.github/workflows/lint.yml

@@ -1,10 +1,7 @@
 name: "Lint"
 
 on:
-  push:
-    branches:
-      - master
-  pull_request:
+  workflow_call:
 
 permissions:
   contents: read

.github/workflows/test.yml

@@ -1,9 +1,7 @@
 name: Code Build and Tests
 
 on:
-  push:
-    branches: [master]
-  pull_request:
+  workflow_call:
 
 permissions:
   contents: read