libgtk3 external for brew/port on macOS (#915)

* Add externals for libgtk3 on macOS.

* Add check from alr devel branch

* Add specific Ports CI test

---------

Co-authored-by: Alejandro R. Mosteo <amosteo@unizar.es>

.github/workflows/build-native-master.yml

@@ -0,0 +1,62 @@
+# Please read the TESTING file before modifying this file
+
+# When the same index version is used by various stable and devel `alr`
+# versions, we want to make sure all of them understand the index properly.
+# Besides, there are
+
+name: Build Crate (alr dev)
+# Build the crate with a native toolchain from Alire
+
+env:
+  CHECKS_ORG: alire-project
+  CHECKS_REPO: alire-index-checks
+
+on:
+  pull_request:
+    paths:
+      - 'index/**.toml'
+
+jobs:
+
+  build:
+    name: ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          - windows-latest
+
+    steps:
+    - name: Check out alire-index
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        # Needed to be able to diff and obtain changed files. Furthermore, we
+        # need the full history or else grafted partial branches confuse the
+        # changed files detectors (in both scripts/gh-build-crate.sh and
+        # check-author action).
+
+    - name: Check out alire-index-checks
+      uses: actions/checkout@v3
+      with:
+        repository: ${{env.CHECKS_ORG}}/${{env.CHECKS_REPO}}
+        ref: ${{github.base_ref}}
+        path: ${{env.CHECKS_REPO}}
+
+    - name: Set up devel `alr`
+      uses: alire-project/setup-alire@v2
+      with:
+        branch: 'master'
+
+    - name: Install tar from msys2 (Windows) # Git tar in Actions VM does not seem to work)
+      if: matrix.os == 'windows-latest'
+      run: C:\Users\runneradmin\.cache\alire\msys64\usr\bin\pacman --noconfirm -S tar
+
+    - name: Test crate
+      run: ${{env.CHECKS_REPO}}/scripts/gh-build-crate.sh
+      shell: bash

.github/workflows/build-ports.yml

@@ -0,0 +1,62 @@
+# Please read the TESTING file before modifying this file
+
+# Specific workflow for MacPorts, as we need to disable Brew for this to work
+# so it's difficult to use the other standard workflows.
+
+name: Build Crate (MacPorts)
+# Build the crate with a native toolchain from Alire
+
+env:
+  CHECKS_ORG: alire-project
+  CHECKS_REPO: alire-index-checks
+
+on:
+  pull_request:
+    paths:
+      - 'index/**.toml'
+
+jobs:
+
+  build:
+    name: ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+
+    steps:
+    - name: Check out alire-index
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        # Needed to be able to diff and obtain changed files. Furthermore, we
+        # need the full history or else grafted partial branches confuse the
+        # changed files detectors (in both scripts/gh-build-crate.sh and
+        # check-author action).
+
+    - name: Check out alire-index-checks
+      uses: actions/checkout@v3
+      with:
+        repository: ${{env.CHECKS_ORG}}/${{env.CHECKS_REPO}}
+        ref: ${{github.base_ref}}
+        path: ${{env.CHECKS_REPO}}
+
+    - name: Set up devel `alr`
+      uses: alire-project/setup-alire@v2
+      with:
+        branch: 'master'
+
+    - name: Disable Homebrew
+      run: rm -f $(which brew)
+      shell: bash
+
+    - name: Install Ports
+      uses: melusina-org/setup-macports@v1
+
+    - name: Test crate
+      run: ${{env.CHECKS_REPO}}/scripts/gh-build-crate.sh
+      shell: bash

index/li/libgtk3/libgtk3-external.toml

@@ -11,6 +11,8 @@ kind = "system"
 "fedora" = ["gtk3-devel"]
 arch = ["gtk3"]
 msys2 = ["mingw-w64-x86_64-gtk3"]
+homebrew = ["gtk+3"]
+macports = ["gtk3"]
 
 [[external]]
 kind = "version-output"