Add Gitea workflow that builds Android APKs

.gitea/workflows/build-apk.yaml

@@ -0,0 +1,36 @@
+# Compile and bundle the gui into Android APKs
+# The resulting APKs are uploaded to gitea as artifacts, attached to the workflow run.
+
+name: APK Builder
+run-name: Build Android APK
+on: [push]
+
+jobs:
+  build-apk:
+    runs-on: ubuntu-latest
+    container:
+      image: docker.nubo.sh/inkopslista-builder:2026-01-11
+    strategy:
+      matrix:
+        arch: [aarch64, x86_64]
+    steps:
+      # git clone
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      # set the name of the output .apk based on commit and architecture
+      - run: echo "SHA_SHORT=$(echo ${{ gitea.sha }} | head -c 8)" >> $GITEA_ENV
+      - run: echo "OUT_NAME=inkopslista.${{ env.SHA_SHORT }}.${{ matrix.arch }}.apk" >> $GITEA_ENV
+
+      # build the apk
+      - run: cargo apk build --lib --release -p inkopslista --target ${{ matrix.arch }}-linux-android
+      - run: mv "$CARGO_TARGET_DIR/release/apk/inkopslista.apk" "$OUT_NAME"
+
+      # upload the apk to gitea
+      - uses: https://gitea.com/actions/gitea-upload-artifact@v4
+        with:
+          name : "${{ env.OUT_NAME }}"
+          path: "${{ env.OUT_NAME }}"
+          if-no-files-found: error
+          overwrite: true
+          retention-days: 360 # delete it after one year