chore: setup labeler (#3887)

.github/labeler.yml

@@ -0,0 +1,43 @@
+A-files:
+  - changed-files:
+      - any-glob-to-any-file: actix-files/**
+
+A-http:
+  - changed-files:
+      - any-glob-to-any-file: actix-http/**
+
+A-http-test:
+  - changed-files:
+      - any-glob-to-any-file: actix-http-test/**
+
+A-multipart:
+  - changed-files:
+      - any-glob-to-any-file: actix-multipart/**
+
+A-multipart-derive:
+  - changed-files:
+      - any-glob-to-any-file: actix-multipart-derive/**
+
+A-router:
+  - changed-files:
+      - any-glob-to-any-file: actix-router/**
+
+A-test:
+  - changed-files:
+      - any-glob-to-any-file: actix-test/**
+
+A-web:
+  - changed-files:
+      - any-glob-to-any-file: actix-web/**
+
+A-web-actors:
+  - changed-files:
+      - any-glob-to-any-file: actix-web-actors/**
+
+A-web-codegen:
+  - changed-files:
+      - any-glob-to-any-file: actix-web-codegen/**
+
+A-awc:
+  - changed-files:
+      - any-glob-to-any-file: awc/**

.github/workflows/labeler.yml

@@ -0,0 +1,15 @@
+name: Labeler
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@634933edcd8ababfe52f92936142cc22ac488b1b # v6.0.1

.github/workflows/semver-labeler.yml

@@ -0,0 +1,26 @@
+name: Semver Labeler
+
+on:
+  workflow_run:
+    workflows: [CI]
+    types: [completed]
+
+jobs:
+  semver-label:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          ref: ${{ github.event.workflow_run.head_sha }}
+
+      - name: Install Rust
+        uses: actions-rust-lang/setup-rust-toolchain@1780873c7b576612439a134613cc4cc74ce5538c # v1.15.2
+        with:
+          toolchain: stable
+
+      - uses: JohnTitor/cargo-semver-checks@main
+        with:
+          label-prefix: B-semver-