Tool fails when chart contains ci directory

[fenech]

The function used to merge the CI overrides expects a pointer and so the test fails:

--- FAIL: TestChartTesting (1.55s)
    --- FAIL: TestChartTesting/a_valid_chart_with_ci_override_values_should_succeed (0.00s)
        /home/tom/dev/chart-verifier/internal/chartverifier/checks/charttesting_test.go:78: 
            	Error Trace:	charttesting_test.go:78
            	Error:      	Not equal: 
            	            	expected: "Chart tests have passed"
            	            	actual  : "creating temporary values file: merging extra values: dst must be a pointer"
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1 +1 @@
            	            	-Chart tests have passed
            	            	+creating temporary values file: merging extra values: dst must be a pointer
            	Test:       	TestChartTesting/a_valid_chart_with_ci_override_values_should_succeed

[fenech]

Checks are failing due to something that seems unrelated:

error: dial tcp: lookup api.cert-test.64w3.p1.openshiftapps.com: no such host - verify you have provided the correct host and port and that the server is currently running.

[komish]

/lgtm

Thank you @fenech for finding and fixing this bug!