inttest/build: fix image-pull-proxy test

Previously, the test only worked if it was the first test that uses the
baseImage. Otherwise, the image was already stored in the local
container storage and no additional requests went through the proxy.

Fix by using a clean container storage dir for this test.

Signed-off-by: Adam Cmiel <acmiel@redhat.com>

Author: chmeliik

integration_tests/build_test.go

@@ -2464,6 +2464,11 @@ RUN cp /random-data.bin /data/realBaseImage.bin
 		contextDir := setupTestContext(t)
 		writeContainerfile(contextDir, fmt.Sprintf("FROM %s\n", baseImage))
 
+		// Use a clean container storage dir for this test to ensure the image gets pulled
+		containerStorage, err := createContainerStorageDir()
+		t.Cleanup(func() { removeContainerStorageDir(containerStorage) })
+		Expect(err).ToNot(HaveOccurred())
+
 		outputRef := "localhost/test-image-pull-proxy:" + GenerateUniqueTag(t)
 
 		buildParams := BuildParams{
@@ -2473,9 +2478,10 @@ RUN cp /random-data.bin /data/realBaseImage.bin
 			ImagePullProxy: "http://" + proxyAddr,
 		}
 
-		container := setupBuildContainerWithCleanup(t, buildParams, nil)
+		container := setupBuildContainerWithCleanup(t, buildParams, nil,
+			maybeMountContainerStorage(containerStorage, "taskuser"))
 
-		err := runBuild(container, buildParams)
+		err = runBuild(container, buildParams)
 		Expect(err).ToNot(HaveOccurred())
 
 		_, proxiedRegistry := connectedHosts.Load("registry.access.redhat.com:443")