ci: use host-mounted volume for docker build

.gitea/workflows/build.yaml

@@ -9,16 +9,21 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container:
+      volumes:
+        - /tmp/build-cache:/build-cache
     steps:
-      - name: Checkout
+      - name: Prepare build context on host
-        run: git clone --depth 1 https://github.com/chatwoot/chatwoot.git /source
-
-      - name: Build image
         run: |
-          cd /source
+          mkdir -p /build-cache/chatwoot
+          git clone --depth 1 https://github.com/chatwoot/chatwoot.git /build-cache/chatwoot
+
+      - name: Build Docker image
+        run: |
+          cd /build-cache/chatwoot
           docker build -t gitea.lealcyber.com/akadmin/chatwoot:test             --build-arg RAILS_ENV=production             --build-arg BUNDLE_WITHOUT='development:test:enterprise' .
 
-      - name: Push
+      - name: Push to registry
         run: |
           docker tag gitea.lealcyber.com/akadmin/chatwoot:test                  gitea.lealcyber.com/akadmin/chatwoot:latest
-          echo "Push skipped until registry auth works"
+          echo "Ready to push when GITEA_TOKEN secret is set"