Improve Docker layer 'dockerfile-mode' major mode keybindings (#15414)

* [completion] Fix readme markup.

* [docker] Improve keybindings: save keystrokes and add convenience shortcuts.

* [docker] Remove duplicate bindings.

CHANGELOG.develop

@@ -1916,6 +1916,9 @@ Other:
 - Fixed: broken package declaration for dockerfile-mode
   (thanks to Maximilian Wolff)
 - Added LSP support
+- Dockerfile mode keybindings (thanks to Alfonso Montero):
+  - Flatten ~cb~ and ~cB~ build commands into ~b~ and ~B~ to save keystrokes.
+  - Add keybindings to some =docker= package commands for convenience.
 **** Dotnet
 - Key bindings:
   - Added key bindings for =dotnet= (thanks to Jordan Kaye):

layers/+tools/docker/packages.el

@@ -50,10 +50,14 @@
     :defer t
     :init (add-hook 'dockerfile-mode-local-vars-hook #'spacemacs//docker-dockerfile-setup-backend)
     :config
-    (spacemacs/declare-prefix-for-mode 'dockerfile-mode "mc" "compile")
     (spacemacs/set-leader-keys-for-major-mode 'dockerfile-mode
-      "cb" 'dockerfile-build-buffer
-      "cB" 'dockerfile-build-no-cache-buffer)))
+      "b" 'dockerfile-build-buffer
+      "B" 'dockerfile-build-buffer-no-cache-buffer
+    (with-eval-after-load 'docker
+      (spacemacs/set-leader-keys-for-major-mode 'dockerfile-mode
+        "d" 'docker
+        "i" 'docker-images
+        "p" 'docker-containers))))
 
 (defun docker/post-init-flycheck ()
   (spacemacs/enable-flycheck 'dockerfile-mode))