Add versioning (WIP)

Don't upload the artifact; uploading to flathub
will probably need a different approach.

.gitea/workflows/flatpak.yaml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          key: ${{ runner.os }}-gradle
           restore-keys: ${{ runner.os }}-gradle
       - name: Build Release Uber JAR
         run: ./gradlew packageReleaseUberJarForCurrentOS
@@ -32,3 +32,4 @@ jobs:
           bundle: YAEP.flatpak
           manifest-path: ./flatpak/ch.dissem.YAEP.yml
           cache-key: flatpak-builder-${{ github.sha }}
+          upload-artifact: false