From 49fd2c8478040f909304026de3fdf7cbdfee966e Mon Sep 17 00:00:00 2001
From: Nik Clayton <nik@ngo.org.uk>
Date: Fri, 4 Aug 2023 14:11:30 +0200
Subject: [PATCH] Populate gradle build cache on each push to develop (#3904)

The build cache is used in ci.yml to speed up builds, but it needs to be
populated by building code that's been merged.
---
 .../workflows/populate-gradle-build-cache.yml | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 .github/workflows/populate-gradle-build-cache.yml

diff --git a/.github/workflows/populate-gradle-build-cache.yml b/.github/workflows/populate-gradle-build-cache.yml
new file mode 100644
index 000000000..666d6c58a
--- /dev/null
+++ b/.github/workflows/populate-gradle-build-cache.yml
@@ -0,0 +1,28 @@
+# Build the app on each push to `develop`, populating the build cache to speed
+# up CI on PRs.
+
+name: Populate build cache
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+  build:
+    name: app:buildGreenDebug
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - uses: gradle/gradle-build-action@v2
+        with:
+          cache-read-only: ${{ github.ref != 'refs/heads/main' && github.ref != 'refs/heads/develop' }}
+  
+      - name: Run app:buildGreenDebug
+        run: ./gradlew app:buildGreenDebug