Improve CI

Author: sivayogasubramanian

.github/workflows/build-and-lint-frontend.yml

@@ -13,7 +13,31 @@ env:
   NGINX_IMAGE_NAME: peerprep-nginx
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    outputs:
+      executor: ${{ steps.changes.outputs.executor }}
+      questions: ${{ steps.changes.outputs.questions }}
+      frontend: ${{ steps.changes.outputs.frontend }}
+      nginx: ${{ steps.changes.outputs.nginx }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dorny/paths-filter@v2
+        id: changes
+        with:
+          filters: |
+            executor:
+              - 'executor/**/*'
+            questions:
+              - 'questions/**/*'
+            frontend:
+              - 'frontend/**/*'
+            nginx:
+              - 'nginx/**/*'
+
   build-executor-image:
+    needs: changes
+    if: ${{ needs.changes.outputs.executor == 'true' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -38,6 +62,8 @@ jobs:
           tags: ghcr.io/peerprep/${{ env.EXECUTOR_IMAGE_NAME }}:latest
 
   build-questions-image:
+    needs: changes
+    if: ${{ needs.changes.outputs.questions == 'true' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -60,6 +86,8 @@ jobs:
           tags: ghcr.io/peerprep/${{ env.QUESTIONS_IMAGE_NAME }}:latest
 
   build-frontend-image:
+    needs: changes
+    if: ${{ needs.changes.outputs.frontend == 'true' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -82,6 +110,8 @@ jobs:
           tags: ghcr.io/peerprep/${{ env.FRONTEND_IMAGE_NAME }}:latest
 
   build-nginx-image:
+    needs: changes
+    if: ${{ needs.changes.outputs.nginx == 'true' }}
     runs-on: ubuntu-latest
     permissions:
       contents: read

.github/workflows/build-docker-images.yml

@@ -0,0 +1,33 @@
+name: Build frontend
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  changes:
+    runs-on: ubuntu-latest
+    outputs:
+      frontend: ${{ steps.changes.outputs.frontend }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dorny/paths-filter@v2
+        id: changes
+        with:
+          filters: |
+            frontend:
+              - 'frontend/**/*'
+
+  lint:
+    needs: changes
+    if: ${{ needs.changes.outputs.frontend == 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+      - run: yarn install
+        working-directory: frontend
+      - run: yarn build
+        working-directory: frontend