ci: add pr langauge labeler on pull_request_target event (#379)

* ci: add pr langauge labeler on `pull_request_target` event

* ci: modify elixir extension

Author: bky373

.github/labeler.yml

@@ -0,0 +1,44 @@
+js:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.js"
+
+ts:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.ts"
+
+py:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.py"
+
+java:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.java"
+
+c++:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.cpp"
+
+swift:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.swift"
+
+kotlin:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.kt"
+
+go:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.go"
+
+elixir:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.exs"

.github/workflows/automation.yaml

@@ -11,3 +11,16 @@ jobs:
       pull-requests: write
     steps:
       - uses: toshimaru/auto-author-assign@v2.1.0
+
+  label-lang:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          repo-token: ${{ github.token }}