chore(codeowners): update & add `.github/workflows` directory [skip ci]

CODEOWNERS

 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners
 
-# Owner(s) for everything in the repo, unless a later match takes precedence
+# SECTION: Owner(s) for everything in the repo, unless a later match takes precedence
 # FILE PATTERN                              OWNER(S)
 *                                           @saltstack-formulas/wg
 
-# Owner(s) for files related to `semantic-release`
+# SECTION: Owner(s) for files/directories related to `semantic-release`
 # FILE PATTERN                              OWNER(S)
+/.github/workflows/                         @saltstack-formulas/ssf
 /bin/kitchen                                @saltstack-formulas/ssf
 /docs/TOFS_pattern.rst                      @saltstack-formulas/ssf
 /salt/libsaltcli.jinja                      @saltstack-formulas/ssf
@@ -27,7 +28,7 @@
 /release-rules.js                           @saltstack-formulas/ssf
 /release.config.js                          @saltstack-formulas/ssf
 
-# Owner(s) for specific files/directories
+# SECTION: Owner(s) for specific files/directories
 # FILE PATTERN                              OWNER(S)
 /salt/formulas.sls                          @sticky-note @myii
 /salt/pin.sls                               @hatifnatt