Add: [setup-vcpkg] action to setup vcpkg (#108)

Author: glx22

README.md

@@ -6,6 +6,7 @@ This repository contains several GitHub Actions and Workflows that help with the
 
 - [annotation-check](annotation-check/): Check if any previous job in a workflow has any annotation.
 - [checkout-pull-request](checkout-pull-request/): Checkout all commits of a Pull Request.
+- [setup_vcpkg](setup-vcpkg/): Install vcpkg and configure its cache.
 
 ## Reusing Workflows
 

setup-vcpkg/README.md

@@ -0,0 +1,12 @@
+# OpenTTD - Setup vcpkg
+
+Install `vcpkg` and set it up to use NuGet for binary caching.
+Will install `mono` if the runner OS requires it, or if an install command is provided.
+
+## Usage
+
+```yaml
+    - name: Setup vcpkg
+      id: vcpkg
+      uses: openttd/actions/setup-vcpkg@v6
+```

setup-vcpkg/action.yaml

@@ -0,0 +1,61 @@
+name: 'Setup vcpkg'
+description: 'Installs vcpkg and initialises binary caching via NuGet'
+inputs:
+  vcpkg-location:
+    description: 'Where to install vcpkg'
+    required: true
+    default: '${{ runner.temp }}/vcpkg'
+  mono-install-command:
+    description: 'Command to run to install mono'
+    required: false
+    default: ${{ runner.os == 'macOS' && 'brew install mono' || runner.os == 'Linux' && 'sudo apt-get install -y --no-install-recommends mono-complete' || '' }}
+outputs:
+  vcpkg-location:
+    description: 'Where vcpkg is installed'
+    value: ${{ inputs.vcpkg-location }}
+  vcpkg:
+    description: 'The vcpkg executable'
+    value: '${{ inputs.vcpkg-location }}/vcpkg'
+  vcpkg-cmake:
+    description: 'The vcpkg cmake toolchain'
+    value: '${{ inputs.vcpkg-location }}/scripts/buildsystems/vcpkg.cmake'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install vcpkg
+      shell: bash
+      run: |
+        git clone https://github.com/microsoft/vcpkg "${{ inputs.vcpkg-location }}"
+        cd "${{ inputs.vcpkg-location }}"
+        ./bootstrap-vcpkg.$(if [ "${{ runner.os }}" = "Windows" ]; then echo "bat"; else echo "sh"; fi) -disableMetrics
+
+    - name: Install mono
+      if: inputs.mono-install-command
+      shell: bash
+      run: |
+        ${{ inputs.mono-install-command }}
+
+    - name: Setup NuGet Credentials
+      shell: bash
+      env:
+        FEED_URL: 'https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json'
+      run: |
+        cd "${{ inputs.vcpkg-location }}"
+        ${{ inputs.mono-install-command && 'mono' }} $(./vcpkg fetch nuget | tail -n 1) \
+          sources add \
+          -source "${{ env.FEED_URL }}" \
+          -storepasswordincleartext \
+          -name "GitHub" \
+          -username "${{ github.repository_owner }}" \
+          -password "${{ github.token }}"
+        ${{ inputs.mono-install-command && 'mono' }} $(./vcpkg fetch nuget | tail -n 1) \
+          setapikey "${{ github.token }}" \
+          -source "${{ env.FEED_URL }}"
+
+    - name: Setup vcpkg caching
+      uses: actions/github-script@v8
+      with:
+        script: |
+          core.exportVariable('VCPKG_BINARY_SOURCES', 'clear;nuget,GitHub,readwrite')
+