Strip leading & trailing whitespaces in CI/CD secret variable keys

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/concerns/has_variable.rb

@@ -16,6 +16,10 @@ module HasVariable
        key: Gitlab::Application.secrets.db_key_base,
        algorithm: 'aes-256-cbc'
 
+    def key=(new_key)
+      super(new_key.to_s.strip)
+    end
+
     def to_runner_variable
       { key: key, value: value, public: false }
     end

changelogs/unreleased/40561-environment-scope-value-is-not-trimmed.yml

@@ -0,0 +1,5 @@
+---
+title: Strip leading & trailing whitespaces in CI/CD secret variable keys
+merge_request: 15615
+author:
+type: fixed

spec/models/concerns/has_variable_spec.rb

@@ -9,6 +9,24 @@ describe HasVariable do
   it { is_expected.not_to allow_value('foo bar').for(:key) }
   it { is_expected.not_to allow_value('foo/bar').for(:key) }
 
+  describe '#key=' do
+    context 'when the new key is nil' do
+      it 'strips leading and trailing whitespaces' do
+        subject.key = nil
+
+        expect(subject.key).to eq('')
+      end
+    end
+
+    context 'when the new key has leadind and trailing whitespaces' do
+      it 'strips leading and trailing whitespaces' do
+        subject.key = ' my key '
+
+        expect(subject.key).to eq('my key')
+      end
+    end
+  end
+
   describe '#value' do
     before do
       subject.value = 'secret'