workaround for unsupported hashFiles function

.gitea/workflows/build_android.yml

@@ -33,13 +33,25 @@ jobs:
                     java-version: '17'
                     cache: 'gradle'
 
+            -   name: Set up Go environment
+                uses: actions/setup-go@v3
+                with:
+                    go-version: '1.20'
+
+            -   name: Get hash of Gradle files
+                uses: actions/go-hashfiles@v0.0.1
+                id: get-hash
+                with: 
+                    patterns: |-
+                        **/*.gradle*
+
             -   name: Cache Gradle
                 uses: actions/cache@v3
                 with:
                     path: |
                         ~/.gradle/caches
                         ~/.gradle/wrapper
-                    key: gradle-${{ runner.os }}-${{ hashFiles('**/*.gradle*') }}
+                    key: gradle-${{ runner.os }}-${{ steps.get-hash.outputs.hash }}
 
             -   name: Get app version
                 id: get_version