re-add usage() function

repo-mgmt

@@ -23,6 +23,31 @@ readonly APKBUILD_GIT_REPO_BASE="https://git.noveria.org/APKBUILD"
 # Miscellaneous functions
 ##
 
+function usage() {
+  echo -e "Noveria Alpine Linux repository build management
+
+Usage: $(basename $0) <operations> [...]
+
+Operations:
+  Miscellaneous:
+    -h, --help                      Usage information
+    -p, --publish                   Publish files to webserver (not yet implemented)
+    --debug                         Start debug-container bash shell
+    --init                          Initialize local directories & abuild keys
+  
+  Podman:
+    -b, --build                     (Re)build podman image
+  
+  DB management:
+    -d, --delete <pkgname>          Delete package
+    -r, --refresh                   Refresh APKINDEX with packages in repo
+    -s, --sign                      Sign APKINDEX with abuild private key
+  
+  Package management:
+    -k, --apkbuild                  Build binary package from APKBUILD and move to, refresh and sign local repository
+"
+}
+
 function init_local() {
   if [[ ! -d "${BUILD_DIR}" || ! -d "${REPO_DIR}" || ! -d "${KEYS_DIR}" || ! -f "${PKG_LIST_FILE}" ]]; then
     message_blue_double_colon "Initializing local directories"