Improve GitHub Actions CI config

.github/workflows/main.yml

@@ -1,9 +1,14 @@
 name: CI
 on:
   push:
-    branches-ignore: [master]
+    branches:
+      - auto-cargo
+      - try
+      - automation/bors/try
+      - "rust-**"
   pull_request:
-    branches: ['*']
+    branches:
+      - "**"
 
 defaults:
   run:
@@ -12,6 +17,10 @@ defaults:
 permissions:
   contents: read
 
+concurrency:
+  group: "${{ github.workflow }}-${{ (github.ref == 'refs/heads/try' && github.sha) || github.ref }}"
+  cancel-in-progress: true
+
 jobs:
   success:
     permissions:
@@ -53,17 +62,23 @@ jobs:
   # Check Code style quickly by running `rustfmt` over all code
   rustfmt:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - run: rustup update stable && rustup default stable
     - run: rustup component add rustfmt
     - run: cargo fmt --all --check
 
   # Ensure there are no clippy warnings
   clippy:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
       - run: rustup update stable && rustup default stable
       - run: rustup component add clippy
       - run: cargo clippy --workspace --all-targets --no-deps -- -D warnings
@@ -72,19 +87,25 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
       - run: rustup update stable && rustup default stable
       - run: cargo stale-label
 
   # Ensure Cargo.lock is up-to-date
   lockfile:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
       - run: rustup update stable && rustup default stable
       - run: cargo update -p cargo --locked
 
   check-version-bump:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     env:
       BASE_SHA: ${{ github.event.pull_request.base.sha }}
       HEAD_SHA: ${{ github.event.pull_request.head.sha != '' && github.event.pull_request.head.sha || github.sha  }}
@@ -108,6 +129,7 @@ jobs:
       CARGO_PROFILE_TEST_DEBUG: 1
       CARGO_INCREMENTAL: 0
       CARGO_PUBLIC_NETWORK_TESTS: 1
+    if: "github.repository == 'rust-lang/cargo'"
     strategy:
       matrix:
         include:
@@ -142,6 +164,8 @@ jobs:
     name: Tests ${{ matrix.name }}
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - name: Dump Environment
       run: ci/dump-environment.sh
     - run: rustup update --no-self-update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
@@ -191,15 +215,21 @@ jobs:
 
   resolver:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - run: rustup update stable && rustup default stable
     - run: cargo test -p resolver-tests
 
   test_gitoxide:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
       - run: rustup update --no-self-update stable && rustup default stable
       - run: rustup target add i686-unknown-linux-gnu
       - run: sudo apt update -y && sudo apt install gcc-multilib libsecret-1-0 libsecret-1-dev -y
@@ -210,8 +240,11 @@ jobs:
 
   build_std:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - run: rustup update nightly && rustup default nightly
     - run: rustup component add rust-src
     - run: cargo build
@@ -220,8 +253,11 @@ jobs:
         CARGO_RUN_BUILD_STD_TESTS: 1
   docs:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - run: rustup update nightly && rustup default nightly
     - run: rustup update stable
     - run: rustup component add rust-docs
@@ -247,7 +283,10 @@ jobs:
 
   msrv:
     runs-on: ubuntu-latest
+    if: "github.repository == 'rust-lang/cargo'"
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
     - uses: taiki-e/install-action@cargo-hack
     - run: cargo hack check --all-targets --rust-version --workspace --ignore-private