feat: add release github job

Resolves #5 on GitHub

Co-Authored-by: Sam Clusker <9279784+samclusker@users.noreply.github.com>

Author: janezicmatej

.github/workflows/release.yml

@@ -0,0 +1,48 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Check if stable release
+        id: check
+        run: |
+          # align with build-docker.yml: stable only for strict semver tags
+          if [[ "${{ github.ref_name }}" =~ ^v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$ ]]; then
+            echo "stable=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "stable=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Extract changelog
+        id: changelog
+        run: |
+          tag="${{ github.ref_name }}"
+          body=$(sed -n "/^\# .*\[${tag}\]/,/^\# .*\[v/{/^\# .*\[v/!p}" CHANGELOG.md || true)
+          cat >> "$GITHUB_OUTPUT" <<DELIM
+          body<<EOF
+          ${body}
+
+          **Full Changelog**: https://github.com/${{ github.repository }}/blob/${tag}/CHANGELOG.md
+          EOF
+          DELIM
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          body: ${{ steps.changelog.outputs.body }}
+          draft: false
+          prerelease: ${{ steps.check.outputs.stable != 'true' }}
+          make_latest: ${{ steps.check.outputs.stable == 'true' }}