Allow masking ~ character

app/models/concerns/ci/maskable.rb

@@ -9,9 +9,9 @@ module Ci
     # * No variables
     # * No spaces
     # * Minimal length of 8 characters
-    # * Characters must be from the Base64 alphabet (RFC4648) with the addition of '@', ':' and '.'
+    # * Characters must be from the Base64 alphabet (RFC4648) with the addition of '@', ':', '.', and '~'
     # * Absolutely no fun is allowed
-    REGEX = /\A[a-zA-Z0-9_+=\/@:.-]{8,}\z/.freeze
+    REGEX = /\A[a-zA-Z0-9_+=\/@:.~-]{8,}\z/.freeze
 
     included do
       validates :masked, inclusion: { in: [true, false] }

spec/frontend/ci_variable_list/components/ci_variable_modal_spec.js

@@ -226,7 +226,7 @@ describe('Ci variable modal', () => {
         };
         createComponent(mount);
         store.state.variable = validMaskandKeyVariable;
-        store.state.maskableRegex = /^[a-zA-Z0-9_+=/@:-]{8,}$/;
+        store.state.maskableRegex = /^[a-zA-Z0-9_+=/@:.~-]{8,}$/;
       });
 
       it('does not disable the submit button', () => {

spec/models/concerns/ci/maskable_spec.rb

@@ -66,7 +66,7 @@ RSpec.describe Ci::Maskable do
     end
 
     it 'matches valid strings' do
-      expect(subject.match?('Hello+World_123/@:-.')).to eq(true)
+      expect(subject.match?('Hello+World_123/@:-~.')).to eq(true)
     end
   end