improve github action setup (#4718)

.github/actions/setup/action.yml

@@ -0,0 +1,18 @@
+name: 'Setup build environment'
+description: 'Sets up an environment for building Tusky'
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+
+    - name: Copy CI gradle.properties
+      shell: bash
+      run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties
+
+    - name: Gradle Build Action
+      uses: gradle/actions/setup-gradle@v4
+      with:
+        cache-read-only: ${{ github.ref != 'refs/heads/main' && github.ref != 'refs/heads/develop' }}