treewide: run gofmt -s and enable linter

Change-Id: I90b8ef48c955dccfddc5bbc0a57205b7da844b60
Reviewed-on: https://review.monogon.dev/c/monogon/+/3828
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/build/toolbase/workspace.go b/build/toolbase/workspace.go
index b8582af..f1d9f08 100644
--- a/build/toolbase/workspace.go
+++ b/build/toolbase/workspace.go
@@ -19,9 +19,9 @@
 // WorkspaceDirectory returns the workspace directory from which a given
 // command line tool is running. This handles the following cases:
 //
-// 1. The command line tool was invoked via `bazel run`.
-// 2. The command line tool was started directly in a workspace directory (but
-//    not a subdirectory).
+//  1. The command line tool was invoked via `bazel run`.
+//  2. The command line tool was started directly in a workspace directory (but
+//     not a subdirectory).
 //
 // If the workspace directory path cannot be inferred based on the above
 // assumptions, an error is returned.