.github: add workflow for github releases

when tag xlibre-xserver-* is pushed, automatically create a github release.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

.github/scripts/github/make-release

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+err() {
+    echo "$0: $*"
+}
+
+[ "$GITHUB_REPOSITORY" ] || err "missing variable GITHUB_REPOSITORY"
+
+TITLE=$(git tag -l --format='%(contents)' $tag)
+
+echo "tag=$tag"
+echo "title=$TITLE"
+
+gh release create "$tag" \
+        --repo="$GITHUB_REPOSITORY" \
+        --title="$tag" \
+        --generate-notes