feat: add icon for ShellCheck rc files (#3210)

Signed-off-by: Philipp Kief <philipp.kief@gmx.de>
Co-authored-by: Philipp Kief <philipp.kief@gmx.de>

Author: marlondecol

icons/shellcheck.svg

@@ -3352,6 +3352,13 @@ export const fileIcons: FileIcons = {
       name: 'toc',
       fileExtensions: ['toc'],
     },
+    {
+      name: 'shellcheck',
+      patterns: {
+        shellcheckrc: FileNamePattern.Dotfile,
+      },
+      light: true,
+    },
     {
       name: 'cue',
       fileExtensions: ['cue'],