Update build and deploy workflows to support branch-specific builds and Java setup

.gitea/workflows/build.yml

@@ -1,5 +1,8 @@
 name: Build
-on: [push]
+on:
+  push:
+    branches:
+      - '*'
 jobs:
   build:
     runs-on: standard-latest

.gitea/workflows/deploy.yml

@@ -10,6 +10,13 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin' # See 'Supported distributions' for available options
+          java-version: '21'
+          cache: 'gradle'
+
       - name: Login
         with: # Set the secret as an input
           package_rw: ${{ secrets.PACKAGE_RW }}