Add macos and windows runners to CI

Add macos and windows runners to CI so that we can make sure that as
changes are introduced that we continue to be able to build for unix
based platforms, macos, and windows.

This relates to issue #218.

Signed-off-by: Ali Caglayan <alizter@gmail.com>

<!-- ps-id: 807cf6ba-18b3-4531-8f95-a62740a3ae96 -->

.github/workflows/test.yml

@@ -8,13 +8,20 @@ name: Test
 
 jobs:
   test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
     name: Test
     env:
       PROJECT_NAME_UNDERSCORE: git_ps_ci_github_actions_workflow
       CARGO_INCREMENTAL: 0
       # RUSTFLAGS: -Zprofile -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort
       # RUSTDOCFLAGS: -Cpanic=abort
-    runs-on: ubuntu-latest
+    runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -35,9 +42,19 @@ jobs:
             ~/.cargo/registry/cache
             target
           key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('Cargo.lock') }}
-      - name: Install GPGME
+      - name: Install GPGME (unix)
+        if : ${{ matrix.os == 'ubuntu-latest' }}
+        run: sudo apt-get install -y libgpgme-dev
+      - name: Install GPGME (macos)
+        if : ${{ matrix.os == 'macos-latest' }}
+        run: brew update && brew install gpgme
+      - name: Install GPGME (windows)
+        if : ${{ matrix.os == 'windows-latest' }}
+        env:
+          GNUPG_VERSION: 2.3.8_20221013 
         run: |
-          sudo apt-get install -y libgpgme-dev
+          curl "https://gnupg.org/ftp/gcrypt/binary/gnupg-w32-${GNUPG_VERSION}.exe" --output gnupg.exe
+          ./gnupg.exe
       - name: Run Tests
         run: |
           cargo test