Automate labeling and CI conditional execution

.github/labeler.yaml

@@ -0,0 +1,14 @@
+ci:
+  - changed-files:
+      - any-glob-to-any-file:
+          - .github/**
+
+frontend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - frontend/**
+
+backend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - backend/**

.github/workflows/backend.yaml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches:
       - main
+    paths:
+      - "backend/**"
+      - ".github/workflows/**"
 
 env:
   CARGO_TERM_COLOR: always

.github/workflows/frontend.yml

@@ -7,13 +7,16 @@ on:
   pull_request:
     branches:
       - main
+    paths:
+      - "frontend/**"
+      - ".github/workflows/**"
 
 env:
   CI: true
 
 jobs:
-  test:
-    name: test
+  ci:
+    name: ci
     runs-on: ubuntu-latest
     defaults:
       run:

.github/workflows/labeler.yml

@@ -0,0 +1,14 @@
+name: "pull request labeler"
+on:
+  - pull_request_target
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          configuration-path: .github/labeler.yaml