Add GitHub Actions workflow for releasing tarball on tag push

.github/workflows/release-tarball.yml

@@ -0,0 +1,41 @@
+name: Release tarball
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    runs-on: debian-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y autoconf automake autopoint gettext git libtool make texinfo g++
+
+    - name: Run autogen
+      run: ./autogen.sh
+
+    - name: Configure
+      run: |
+        export CC=gcc CXX=g++
+        ./configure
+
+    - name: Build and Test
+      run: make distcheck
+
+    - name: Extract Tag Name
+      id: extract_tag
+      run: echo "TAG_NAME=${GITHUB_REF##*/}" >> $GITHUB_ENV
+
+    - name: Upload Release Asset
+      uses: actions/upload-release-asset@v1
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ./fswatch-${{ env.TAG_NAME }}.tar.gz
+        asset_name: fswatch-${{ env.TAG_NAME }}.tar.gz
+        asset_content_type: application/gzip