Add Go command variables

This is a squash commit, it includes:
* Add go run and go test command variables
* Update go README for go-run-command and go-test-command
* Update CHANGELOG

CHANGELOG.develop

@@ -2000,6 +2000,8 @@ Other:
   - Make flycheck disable checkers covered by golangci (thanks to zhuoyikang)
   - Updated build instructions for =golangci-lint= (thanks to pancho horrillo)
   - Added =dap-go= integration (ljupchokotev)
+  - Added =go-run-command= variable (thanks to Jay Z)
+  - Added =go-test-command= variable (thanks to Jay Z)
 - Key bindings
   - =godoctor= key bindings (thanks to TinySong and Eivind Fonn):
     - ~SPC m r n~ to rename

layers/+lang/go/README.org

@@ -104,6 +104,14 @@ layers are enabled as well.
 
 * Configuration
 ** Execution
+By default, the go run command is =go run=. If you want to use a different
+command or run with environment variables, set the layer variable
+=go-run-command=.
+
+#+BEGIN_SRC emacs-lisp
+  (go :variables go-run-command "ENV_VAR=foo go run")
+#+END_SRC
+
 To run the current =main= package with command line arguments, set the value of
 =go-run-args= as a file local variable, e.g.
 
@@ -174,6 +182,14 @@ Tests are run in a compilation buffer displayed in a popup window that can be
 closed by pressing ~C-g~ from any other window. The variable =go-test-buffer-name=
 can be customized to set the output buffer name.
 
+By default, the go test command is =go test=. If you want to use a different
+command or test with environment variables, set the layer variable
+=go-test-command=.
+
+#+BEGIN_SRC emacs-lisp
+  (go :variables go-test-command "ENV_VAR=foo go test")
+#+END_SRC
+
 To provide additional arguments to =go test=, specify =go-use-test-args=.
 
 #+BEGIN_SRC emacs-lisp

layers/+lang/go/config.el

@@ -44,3 +44,9 @@ If `nil' then `go-mode' is the default backend unless `lsp' layer is used.")
 
 (defvar go-run-args ""
   "Additional arguments to by supplied to `go run` during runtime.")
+
+(defvar go-run-command "go run"
+  "Go run command. Default is `go run`.")
+
+(defvar go-test-command "go test"
+  "Go test command. Default is `go test`.")

layers/+lang/go/funcs.el

@@ -110,7 +110,7 @@
 
 (defun spacemacs/go-run-tests (args)
   (interactive)
-  (compilation-start (concat "go test " (when go-test-verbose "-v ") args " " go-use-test-args)
+  (compilation-start (concat go-test-command " " (when go-test-verbose "-v ") args " " go-use-test-args)
                      nil (lambda (n) go-test-buffer-name) nil))
 
 (defun spacemacs/go-run-package-tests ()
@@ -148,7 +148,7 @@
 (defun spacemacs/go-run-main ()
   (interactive)
   (shell-command
-   (format "go run %s %s"
+   (format (concat go-run-command " %s %s")
            (shell-quote-argument (or (file-remote-p (buffer-file-name (buffer-base-buffer)) 'localname)
                                      (buffer-file-name (buffer-base-buffer))))
            go-run-args)))