Upload release asset during CI workflow

Author: gulachek

.github/workflows/release.yml

@@ -36,3 +36,16 @@ jobs:
         with:
           name: msgstream-tarball
       - run: script/test-release.sh msgstream-*.tgz
+  upload-package:
+    needs: test-package
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      GH_TOKEN: ${{ github.token }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        with:
+          name: msgstream-tarball
+      - run: script/upload-package.sh msgstream-*.tgz

script/parse-validate-version.sh

@@ -12,3 +12,6 @@ if [ "$PUBLISH_VERSION" != "$PACKAGE_VERSION" ]; then
 	echo "Version in GITHUB_REF '$GITHUB_REF' does not match package.json version $PACKAGE_VERSION"
 	exit 1
 fi
+
+# We now know this is the same
+VERSION="$PACKAGE_VERSION"

script/upload-package.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+set -x
+
+# Validates and sets VERSION
+. script/parse-validate-version.sh
+
+PKG="${1:?Usage: $0 <msgstream-x.x.x.tgz>}"
+
+if [ "$(basename $PKG)" != "msgstream-$VERSION.tgz" ]; then
+	echo "Unexpected tarball '$PKG' given to $0"
+	exit 1
+fi
+
+gh release upload "v$VERSION" "$PKG#Source Package"