Problem: no macOS support

Solution: install tailscale from homebrew

.github/workflows/tailscale.yml

@@ -11,7 +11,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest ]
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Check out code
         uses: actions/checkout@v2

action.yml

@@ -44,7 +44,7 @@ runs:
     using: 'composite'
     steps:
       - name: Check Runner OS
-        if: ${{ runner.os != 'Linux' }}
+        if: ${{ runner.os != 'Linux' && runner.os != 'macOS' }}
         shell: bash
         run: |
           echo "::error title=⛔ error hint::Support Linux Only"
@@ -56,6 +56,7 @@ runs:
           echo "::error title=⛔ error hint::OAuth identity empty, Maybe you need to populate it in the Secrets for your workflow, see more in https://docs.github.com/en/actions/security-guides/encrypted-secrets and https://tailscale.com/s/oauth-clients"
           exit 1
       - name: Download Tailscale
+        if: ${{ runner.os == 'Linux' }}
         shell: bash
         id: download
         env:
@@ -90,6 +91,10 @@ runs:
           rm tailscale.tgz
           TSPATH=/tmp/tailscale_${VERSION}_${TS_ARCH}
           sudo mv "${TSPATH}/tailscale" "${TSPATH}/tailscaled" /usr/bin
+      - name: Download Tailscale
+        if: ${{ runner.os == 'macOS' }}
+        shell: bash
+        run: brew install tailscale coreutils # timeout comes with coreutils
       - name: Start Tailscale Daemon
         shell: bash
         env:
@@ -109,7 +114,11 @@ runs:
           TS_EXPERIMENT_OAUTH_AUTHKEY: true
         run: |
           if [ -z "${HOSTNAME}" ]; then
-            HOSTNAME="github-$(cat /etc/hostname)"
+            if [ -f /etc/hostname ]; then
+              HOSTNAME="github-$(cat /etc/hostname)"
+            else
+              HOSTNAME="github-$(hostname)"
+            fi
           fi
           if [ -n "${{ inputs['oauth-secret'] }}" ]; then
             TAILSCALE_AUTHKEY="${{ inputs['oauth-secret'] }}?preauthorized=true&ephemeral=true"