forgejo-release.sh: Allow arguments to be checked in check_dependencies

This allows us to pass in extra dependencies in testing scenarios. In this case sign_release requires gpg to run.

forgejo-release.sh

@@ -43,8 +43,16 @@ get_arch() {
 }
 
 check_dependencies() {
+    # Always required for API parsing and downloads
+    deps="curl jq"
+
+    # Append any extra arguments to the list of dependencies to check
+    if [ "$#" -gt 0 ]; then
+        deps="$deps $*"
+    fi
+
     missing=""
-    for cmd in curl jq; do
+    for cmd in $deps; do
         if ! command -v "$cmd" >/dev/null 2>&1; then
             missing="$missing $cmd"
         fi
@@ -165,6 +173,7 @@ maybe_use_release_note_assistant() {
 }
 
 sign_release() {
+    check_dependencies gpg
     passphrase=""
     if [ -s "$GPG_PASSPHRASE" ]; then
         passphrase="--passphrase-file $GPG_PASSPHRASE"