compliance: cleanup compliance test code

zot ci/cd tests are too stict, so separate and relax them for compliance
tests.

Location header is set in some cases, but some clarification is needed
in URL construction.

Fix some incorrect compliance tests.

pkg/api/regexp.go

@@ -6,7 +6,7 @@ import "regexp"
 var (
 	// alphaNumericRegexp defines the alpha numeric atom, typically a
 	// component of names. This only allows lower case characters and digits.
-	alphaNumericRegexp = match(`[a-z0-9]+`)
+	alphaNumericRegexp = match(`[a-zA-Z0-9]+`)
 
 	// separatorRegexp defines the separators allowed to be embedded in name
 	// components. This allow one period, one or two underscore and multiple