ci: build only changed services with registry cache

.gitea/workflows/build.yaml

@@ -7,34 +7,89 @@ on:
       - high-performance
 
 jobs:
+  detect-changes:
+    runs-on: ubuntu-latest
+    outputs:
+      services: ${{ steps.detect.outputs.services }}
+      has_changes: ${{ steps.detect.outputs.has_changes }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Detect changed services
+        id: detect
+        run: |
+          set -euo pipefail
+
+          if git rev-parse --verify HEAD^ >/dev/null 2>&1; then
+            CHANGED_FILES=$(git diff --name-only HEAD^ HEAD)
+          else
+            CHANGED_FILES=$(git ls-files)
+          fi
+
+          echo "Changed files:"
+          echo "$CHANGED_FILES"
+
+          ALL_SERVICES='["gateway","users","companies","jobs","leads","job-seekers","customers","payments","employees","photographers","makeup-artists","tutors","developers","video-editors","graphic-designers","social-media-managers","fitness-trainers","catering-services","ugc-content-creators","cron"]'
+
+          # Build everything for workflow/docker/shared backend changes.
+          if echo "$CHANGED_FILES" | grep -Eq '^(\.gitea/workflows/|Dockerfile|Dockerfile\.|Cargo\.toml|Cargo\.lock|crates/|scripts/)'; then
+            echo "services=$ALL_SERVICES" >> "$GITHUB_OUTPUT"
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          SERVICES='[]'
+          add_service() {
+            local svc="$1"
+            SERVICES=$(echo "$SERVICES" | jq --arg s "$svc" 'if index($s) then . else . + [$s] end')
+          }
+
+          while IFS= read -r f; do
+            case "$f" in
+              apps/gateway/*) add_service "gateway" ;;
+              apps/users/*) add_service "users" ;;
+              apps/companies/*) add_service "companies" ;;
+              apps/jobs/*) add_service "jobs" ;;
+              apps/leads/*) add_service "leads" ;;
+              apps/job_seekers/*) add_service "job-seekers" ;;
+              apps/customers/*) add_service "customers" ;;
+              apps/payments/*) add_service "payments" ;;
+              apps/employees/*) add_service "employees" ;;
+              apps/photographers/*) add_service "photographers" ;;
+              apps/makeup_artists/*) add_service "makeup-artists" ;;
+              apps/tutors/*) add_service "tutors" ;;
+              apps/developers/*) add_service "developers" ;;
+              apps/video_editors/*) add_service "video-editors" ;;
+              apps/graphic_designers/*) add_service "graphic-designers" ;;
+              apps/social_media_managers/*) add_service "social-media-managers" ;;
+              apps/fitness_trainers/*) add_service "fitness-trainers" ;;
+              apps/catering_services/*) add_service "catering-services" ;;
+              apps/ugc_content_creators/*) add_service "ugc-content-creators" ;;
+              apps/cron/*) add_service "cron" ;;
+            esac
+          done <<< "$CHANGED_FILES"
+
+          if [ "$(echo "$SERVICES" | jq 'length')" -eq 0 ]; then
+            echo "services=[]" >> "$GITHUB_OUTPUT"
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "services=$SERVICES" >> "$GITHUB_OUTPUT"
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+          fi
+
   build:
+    needs: detect-changes
+    if: needs.detect-changes.outputs.has_changes == 'true'
     runs-on: ubuntu-latest
     env:
       DOCKER_HOST: unix:///var/run/docker.sock
     strategy:
       fail-fast: false
       matrix:
-        service:
-          - gateway
-          - users
-          - companies
-          - jobs
-          - leads
-          - job-seekers
-          - customers
-          - payments
-          - employees
-          - photographers
-          - makeup-artists
-          - tutors
-          - developers
-          - video-editors
-          - graphic-designers
-          - social-media-managers
-          - fitness-trainers
-          - catering-services
-          - ugc-content-creators
-          - cron
+        service: ${{ fromJson(needs.detect-changes.outputs.services) }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -61,6 +116,8 @@ jobs:
           docker buildx build --push \
             -f Dockerfile.simple \
             --build-arg SERVICE_NAME=${{ matrix.service }} \
+            --cache-from type=registry,ref=$REGISTRY_HOSTPORT/nxtgauge-rust-${{ matrix.service }}:buildcache \
+            --cache-to type=registry,ref=$REGISTRY_HOSTPORT/nxtgauge-rust-${{ matrix.service }}:buildcache,mode=max \
             -t "$REGISTRY_HOSTPORT/nxtgauge-rust-${{ matrix.service }}:${{ gitea.sha }}" \
             -t "$REGISTRY_HOSTPORT/nxtgauge-rust-${{ matrix.service }}:high-performance-latest" \
             .