feat(build): Add support for remote Gradle build cache (#4357)

.github/workflows/pull-request.yml

@@ -54,9 +54,7 @@ jobs:
     with:
       api_levels: '[35]' # Run only on API 35 for PRs
       test_flavors: 'google' # Run only Google flavor for PRs (faster)
-    secrets:
-      GRADLE_ENCRYPTION_KEY: ${{ secrets.GRADLE_ENCRYPTION_KEY }}
-      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    secrets: inherit
 
   # This job handles the case when no code changes are detected (docs-only PRs)
   skip-notice:

.github/workflows/release.yml

@@ -34,6 +34,8 @@ on:
         required: true
       GRADLE_ENCRYPTION_KEY:
         required: true
+      GRADLE_CACHE_URL:
+        required: false
 
 concurrency:
   group: ${{ github.workflow }}-${{ inputs.tag_name }}
@@ -144,6 +146,7 @@ jobs:
         env:
           VERSION_NAME: ${{ needs.prepare-build-info.outputs.APP_VERSION_NAME }}
           VERSION_CODE: ${{ needs.prepare-build-info.outputs.APP_VERSION_CODE }}
+          GRADLE_CACHE_URL: ${{ secrets.GRADLE_CACHE_URL }}
         run: bundle exec fastlane internal
 
       - name: Upload Google AAB artifact
@@ -213,6 +216,7 @@ jobs:
         env:
           VERSION_NAME: ${{ needs.prepare-build-info.outputs.APP_VERSION_NAME }}
           VERSION_CODE: ${{ needs.prepare-build-info.outputs.APP_VERSION_CODE }}
+          GRADLE_CACHE_URL: ${{ secrets.GRADLE_CACHE_URL }}
         run: bundle exec fastlane fdroid_build
 
       - name: Upload F-Droid APK artifact

.github/workflows/reusable-android-build.yml

@@ -11,6 +11,8 @@ on:
         required: false
       CODECOV_TOKEN:
         required: false
+      GRADLE_CACHE_URL:
+        required: false
     inputs:
       upload_artifacts:
         description: 'Whether to upload build and Detekt artifacts'
@@ -30,6 +32,7 @@ jobs:
       DATADOG_APPLICATION_ID: ${{ secrets.DATADOG_APPLICATION_ID }}
       DATADOG_CLIENT_TOKEN: ${{ secrets.DATADOG_CLIENT_TOKEN }}
       MAPS_API_KEY: ${{ secrets.GOOGLE_MAPS_API_KEY }}
+      GRADLE_CACHE_URL: ${{ secrets.GRADLE_CACHE_URL }}
 
     steps:
 

.github/workflows/reusable-android-test.yml

@@ -23,11 +23,15 @@ on:
         required: false
       CODECOV_TOKEN:
         required: true
+      GRADLE_CACHE_URL:
+        required: false
 
 jobs:
   androidTest:
     runs-on: ubuntu-latest
     timeout-minutes: 45
+    env:
+      GRADLE_CACHE_URL: ${{ secrets.GRADLE_CACHE_URL }}
     strategy:
       matrix:
         api-level: ${{ fromJson(inputs.api_levels) }} # Use the input to define the matrix

settings.gradle.kts

@@ -70,6 +70,26 @@ plugins {
     id("com.gradle.common-custom-user-data-gradle-plugin") version "2.4.0"
 }
 
+fun Settings.getMeshProperty(key: String): String? {
+    val env = System.getenv(key)
+    if (!env.isNullOrBlank()) return env
+
+    val localFile = file("local.properties")
+    if (localFile.exists()) {
+        val props = java.util.Properties()
+        localFile.inputStream().use { props.load(it) }
+        if (props.containsKey(key)) return props.getProperty(key)
+    }
+
+    val configFile = file("config.properties")
+    if (configFile.exists()) {
+        val props = java.util.Properties()
+        configFile.inputStream().use { props.load(it) }
+        if (props.containsKey(key)) return props.getProperty(key)
+    }
+    return null
+}
+
 develocity {
     buildScan {
         capture {
@@ -82,14 +102,17 @@ develocity {
             isEnabled = true
         }
         remote(HttpBuildCache::class.java) {
-            isAllowInsecureProtocol = true
-            // Replace with your selfhosted instance address
-            // see: https://docs.gradle.org/current/userguide/build_cache.html#sec:build_cache_setup_http_backend
-            url = uri("http://192.168.1.3:5071/cache/")
-
-            // Allow this machine to upload results to the cache
-            isPush = true
-
+            val cacheUrl = getMeshProperty("GRADLE_CACHE_URL")?.trim()
+            if (!cacheUrl.isNullOrBlank()) {
+                println("Meshtastic Build: Remote cache URL found. Using remote build cache.")
+                url = uri(cacheUrl)
+                isAllowInsecureProtocol = true
+                isPush = true
+                isEnabled = true
+            } else {
+                println("Meshtastic Build: Remote cache URL not found. Disabling remote cache write.")
+                isEnabled = false
+            }
         }
     }
 }