ci: add 'test' job (go vet + go test -race) gating docker build

This was supposed to land in d63f195 but the prior Write didn't apply.
CI now runs unit + integration tests on every push and PR ; the docker
image is only pushed on main, after tests pass.

.gitea/workflows/dockerimage.yaml

@@ -1,5 +1,5 @@
 ---
-name: Docker Build
+name: CI/CD
 
 on:
   workflow_dispatch: {}
@@ -8,18 +8,53 @@ on:
       - main
     paths-ignore:
       - 'README.md'
+      - 'AUTH.md'
+      - 'DEPLOY.md'
+      - 'HOWTO_ADD_BOT.md'
       - 'chart/**'
       - '.gitignore'
       - 'Makefile'
       - 'bots.example.yaml'
+      - 'docker-compose.yml'
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - 'README.md'
+      - 'AUTH.md'
+      - 'DEPLOY.md'
+      - 'HOWTO_ADD_BOT.md'
+      - 'chart/**'
+      - '.gitignore'
+      - 'docker-compose.yml'
 
 concurrency:
   group: ${{ github.ref }}-${{ github.workflow }}
   cancel-in-progress: true
 
 jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v4
+
+      - name: setup go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+          cache: true
+
+      - name: go vet
+        run: go vet ./...
+
+      - name: go test (race + count=1)
+        run: go test -race -count=1 -timeout 120s ./...
+
   build-and-push-image:
     runs-on: ubuntu-latest
+    needs: test
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - name: Login to Gitea Container Registry
         uses: docker/login-action@v3