.github: update release workflow to support pre-releases

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/release.yml

@@ -12,6 +12,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Setting release variables ...
+        id: build
+        run: |
+          ver=${GITHUB_REF#refs/tags/}
+          echo "ver=${ver}" >> $GITHUB_OUTPUT
+          if echo $ver | grep -qE '^v[0-9]+\.[0-9]+(\.[0-9]+)?(-alpha|-beta|-rc)[0-9]*$'; then
+            echo "pre=true"  >> $GITHUB_OUTPUT
+          else
+            echo "pre=false" >> $GITHUB_OUTPUT
+          fi
+          if echo $ver | grep -qE '^v[0-9.]+\.[0-9.]+(\.[0-9]+)?$'; then
+            echo "latest=true"  >> $GITHUB_OUTPUT
+          else
+            echo "latest=false" >> $GITHUB_OUTPUT
+          fi
       - name: Creating Makefiles ...
         run: |
           ./autogen.sh
@@ -29,5 +44,7 @@ jobs:
       - uses: ncipollo/release-action@v1
         with:
           name: Mg ${{ github.ref_name }}
+          prerelease: ${{ steps.build.outputs.pre }}
+          makeLatest: ${{ steps.build.outputs.latest }}
           bodyFile: "release.md"
           artifacts: "artifacts/*"