Add a release gh workflow

* Try a release action

* remove validation

* tag pattern fix

* Do a draft release

Author: kolemannix

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v2[0-9].[0-9][0-9].[0-9]*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Extract version from tag
+        id: version
+        run: echo "VERSION=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+
+      - name: Generate checksum
+        run: sha256sum ffc.h > ffc.h.sha256
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          name: ${{ steps.version.outputs.VERSION }}
+          body: |
+            ## ${{ steps.version.outputs.VERSION }}
+
+            Drop `ffc.h` into your project and parse some floats or whatever
+
+            **Verify checksum:**
+            ```
+            sha256sum -c ffc.h.sha256
+            ```
+          files: |
+            ffc.h
+            ffc.h.sha256
+          fail_on_unmatched_files: true
+          generate_release_notes: true
+          draft: true