ci: split PR check and deploy workflows

build.yaml (PR only):
  - cargo build + test + clippy
  - Docker build + push with SHA tag (no :latest)
  - Image exists in registry after PR CI passes

deploy.yaml (main push only):
  - docker pull SHA image (already in registry from PR)
  - docker tag as :latest
  - docker push :latest
  - No rebuild, no cargo steps

.gitea/workflows/build.yaml

@@ -1,11 +1,8 @@
-name: CI
+name: PR Check
 
 on:
-  push:
-    branches: [main]
   pull_request:
     branches: [main]
-  workflow_dispatch:
 
 env:
   REGISTRY: forgejo.riotpiao.com
@@ -14,28 +11,26 @@ env:
   SQLX_OFFLINE: "true"
 
 jobs:
-  ci:
-    name: CI
+  check:
+    name: Build, Test & Image
     runs-on: rust
     steps:
-      - name: Install Node.js and Docker
-        run: |
-          apt-get update
-          apt-get install -y nodejs docker.io
+      - name: Install Docker
+        run: apt-get update && apt-get install -y docker.io
 
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Cargo build all
+      - name: Cargo build
         run: cargo build --all --verbose
 
-      - name: Cargo test all
+      - name: Cargo test
         run: cargo test --all --lib --verbose 2>&1 | tail -150 || true
 
       - name: Cargo clippy
         run: cargo clippy --all --all-targets -- -D warnings 2>&1 | tail -50 || true
 
-      - name: Clean build artifacts before Docker
+      - name: Clean build artifacts
         run: cargo clean
 
       - name: Get short SHA
@@ -50,19 +45,13 @@ jobs:
           REGISTRY_USER: ${{ secrets.FORGEJO_REGISTRY_USER }}
           REGISTRY_TOKEN: ${{ secrets.FORGEJO_REGISTRY_TOKEN }}
 
-      - name: Build Docker image
+      - name: Build and push image (SHA tag only)
         run: |
           docker build --no-cache --progress=plain \
             -t "${IMAGE}:${{ steps.sha.outputs.short_sha }}" \
-            -t "${IMAGE}:latest" \
             -f Dockerfile .
-
-      - name: Push Docker image
-        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
-        run: |
           docker push "${IMAGE}:${{ steps.sha.outputs.short_sha }}"
-          docker push "${IMAGE}:latest"
-          echo "✓ Pushed: ${IMAGE}:${{ steps.sha.outputs.short_sha }}"
+          echo "Pushed: ${IMAGE}:${{ steps.sha.outputs.short_sha }}"
 
-      - name: Prune unused images
+      - name: Prune images
         run: docker image prune -a --force 2>&1 | tail -3 || true