Add Gitea Actions CI workflows — unit tests on push, image builds on tag

- test.yml: run unit tests on every push (all branches)
- release.yml: build and push pic-api + pic-webui images on v*.*.* tags

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -0,0 +1,65 @@
+name: Release — Build and Push Images
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build-api:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Docker login to Gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.pic.ngo
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Docker meta (api)
+        id: meta-api
+        uses: docker/metadata-action@v5
+        with:
+          images: git.pic.ngo/roof/pic-api
+          tags: |
+            type=raw,value=latest
+            type=ref,event=tag
+
+      - name: Build and push pic-api
+        uses: docker/build-push-action@v5
+        with:
+          context: ./api
+          push: true
+          tags: ${{ steps.meta-api.outputs.tags }}
+
+  build-webui:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Docker login to Gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.pic.ngo
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Docker meta (webui)
+        id: meta-webui
+        uses: docker/metadata-action@v5
+        with:
+          images: git.pic.ngo/roof/pic-webui
+          tags: |
+            type=raw,value=latest
+            type=ref,event=tag
+
+      - name: Build and push pic-webui
+        uses: docker/build-push-action@v5
+        with:
+          context: ./webui
+          push: true
+          tags: ${{ steps.meta-webui.outputs.tags }}