Add macOS release steps to Github Actions

This change ports the Travis CI release workflow for macOS to Github
Actions. Note that while this is functionally identical to the
previous Travis CI flow, no work has been done to update the macOS
build scripts to build for arm64.

.github/workflows/release.yml

@@ -13,12 +13,11 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-20.04]
+        os: [ubuntu-20.04, macos-latest]
 
     steps:
     - uses: actions/checkout@v2
 
-
     - name: "ensure version bumped"
       run: |
         expected_tag=$(echo ${{ github.ref }} | cut -d'/' -f3)
@@ -34,17 +33,42 @@ jobs:
       if: ${{ startsWith(matrix.os, 'macos') }}
       run: brew install protobuf automake
 
+    - name: "describe macos build environment"
+      if: ${{ startsWith(matrix.os, 'macos') }}
+      run: |
+        BUILD_TAG=$(echo ${{ github.ref }} | cut -d'/' -f3)
+        mkdir macosx/build-report &&
+        pushd macosx/build-report &&
+        ../brew-deps.sh describe &&
+        ../osx-xcode.sh describe &&
+        tar -cjf "../${BUILD_TAG}-osx-build-report.tbz" . &&
+        popd
+
     - name: "generate build scripts"
       run: ./autogen.sh
 
     - name: "configure"
+      if: ${{ startsWith(matrix.os, 'ubuntu') }}
       run: ./configure --enable-compile-warnings=error --enable-examples
 
     - name: "build"
+      if: ${{ startsWith(matrix.os, 'ubuntu') }}
       run: make V=1
 
     - name: "test"
+      if: ${{ startsWith(matrix.os, 'ubuntu') }}
       run: make V=1 distcheck -j
+    
+    - name: "unshallow git repository for git describe"
+      if: ${{ startsWith(matrix.os, 'macos') }}     
+      run: git fetch --tags --unshallow
+      
+    - name: "macOS package build"
+      if: ${{ startsWith(matrix.os, 'macos') }}
+      run: |
+        pushd macosx &&
+        env ZERO_AR_DATE=1 MACOSX_DEPLOYMENT_TARGET=10.12 ./build.sh &&
+        popd
 
     - name: "Upload Release"
       # v1 aka v0.1.14 as of 2022-07-05; pinned to avoid potential code injection
@@ -57,3 +81,6 @@ jobs:
         generate_release_notes: True
         files: |
           mosh-*.tar.gz
+          macosx/*.pkg
+          macosx/*-osx-build-report.tbz
+