.github: add release workflow

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

.github/workflows/release.yml

@@ -0,0 +1,33 @@
+name: Release General
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+*'
+
+jobs:
+  release:
+    name: Build and upload release tarball
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Creating Makefiles ...
+        run: |
+          ./autogen.sh
+          ./configure --prefix=
+      - name: Build release ...
+        run: |
+          make release
+          mkdir -p artifacts/
+          mv ../*.tar.* artifacts/
+      - name: Extract ChangeLog entry ...
+        run: |
+          awk '/-----*/{if (x == 1) exit; x=1;next}x' ChangeLog.md \
+              |head -n -1 > release.md
+          cat release.md
+      - uses: ncipollo/release-action@v1
+        with:
+          name: Editline v${{ github.ref_name }}
+          bodyFile: "release.md"
+          artifacts: "artifacts/*"