fix: Make release-dir and assets optional

forgejo-release.sh

@@ -84,9 +84,11 @@ upload_release() {
     # It is expanded using "${assets[@]}" which preserves the separation of arguments and not split whitespace containing values.
     # For reference, see https://github.com/koalaman/shellcheck/wiki/SC2086#exceptions
     local assets=()
+    shopt -s nullglob
     for file in "$RELEASE_DIR"/*; do
         assets=("${assets[@]}" -a "$file")
     done
+    shopt -u nullglob
     if $PRERELEASE || echo "${TAG}" | grep -qi '\-rc'; then
         releaseType="--prerelease"
         echo "Uploading as Pre-Release"
@@ -131,12 +133,14 @@ sign_release() {
         passphrase="--passphrase-file $GPG_PASSPHRASE"
     fi
     gpg --import --no-tty --pinentry-mode loopback $passphrase "$GPG_PRIVATE_KEY"
+    shopt -s nullglob
     for asset in "$RELEASE_DIR"/*; do
         if [[ $asset =~ .sha256$ ]]; then
             continue
         fi
         gpg --armor --detach-sign --no-tty --pinentry-mode loopback $passphrase <"$asset" >"$asset".asc
     done
+    shopt -u nullglob
 }
 
 maybe_sign_release() {