Only run checkout if not running locally with act, and update to latest merge ref

.github/workflows/soundness.yml

@@ -79,10 +79,12 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Mark the workspace as safe
         # https://github.com/actions/checkout/issues/766
         run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
@@ -100,10 +102,12 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run documentation check
         run: |
           apt-get -qq update && apt-get -qq -y install curl yq
@@ -116,10 +120,12 @@ jobs:
     timeout-minutes: 1
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run unacceptable language check
         env:
           UNACCEPTABLE_WORD_LIST: ${{ inputs.unacceptable_language_check_word_list}}
@@ -132,10 +138,12 @@ jobs:
     timeout-minutes: 1
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run license header check
         env:
           PROJECT_NAME: ${{ inputs.license_header_check_project_name }}
@@ -148,10 +156,12 @@ jobs:
     timeout-minutes: 1
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run broken symlinks check
         run: curl -s https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/check-broken-symlinks.sh | bash
 
@@ -164,10 +174,12 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Mark the workspace as safe
         # https://github.com/actions/checkout/issues/766
         run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
@@ -185,10 +197,12 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Mark the workspace as safe
         # https://github.com/actions/checkout/issues/766
         run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
@@ -204,10 +218,12 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run yamllint
         run: |
           which yamllint >/dev/null || ( apt-get update && apt-get install -y yamllint )
@@ -224,10 +240,12 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
         with:
           persist-credentials: false
           submodules: true
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Run flake8
         run: |
           pip3 install flake8 flake8-import-order

.github/workflows/swift_package_test.yml

@@ -67,7 +67,10 @@ jobs:
       - name: Swift version
         run: swift --version
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Set environment variables
         if: ${{ inputs.linux_env_vars }}
         run: |
@@ -92,7 +95,10 @@ jobs:
           - ${{ fromJson(inputs.windows_exclude_swift_versions) }}
     steps:
       - name: Checkout repository
+        if: env.ACT != 'true'
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}  # Include changes to the target branch when action is re-run https://github.com/actions/checkout/issues/1036
       - name: Pull Docker image
         id: pull_docker_image
         run: |