GHA: Add release job

Author: phw

.github/workflows/build.yml

@@ -32,3 +32,38 @@ jobs:
       with:
         name: ${{ env.REPO }}-${{ matrix.configuration }}
         path: component/
+
+  release:
+      runs-on: ubuntu-latest
+      if: startsWith(github.ref, 'refs/tags/')
+      needs:
+        - build
+
+      steps:
+      - name: Set repo and version variable
+        run: |
+          echo "REPO=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
+          echo "VERSION=${GITHUB_REF##*/}" >> $GITHUB_ENV
+
+      - uses: actions/download-artifact@v1
+        with:
+          name: ${{ env.REPO }}-Release
+          path: artifacts/${{ env.REPO }}/
+
+      - name: Generate fb2k component package
+        run: |
+          mkdir artifacts/release/
+          cd artifacts/${{ env.REPO }}/
+          zip ../release/${{ env.REPO }}_$VERSION.fb2k-component *
+
+      - name: Generate checksums
+        run: |
+          cd artifacts/release/
+          sha256sum * > SHA256SUMS
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: artifacts/release/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}