test: add test case for setcap in Dockerfile

This is a followup of GoogleContainerTools#1994. This test runs a Dockerfile where setcap is executed. Without the fix in GoogleContainerTools#1994, the last command won't generate any diff and thus is discarded by kaniko and thus should fail this test.
zhouhaibing089 · May 9, 2022 · ba7730b · ba7730b
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diff --git a/integration/dockerfiles-with-context/issue-1851/Dockerfile b/integration/dockerfiles-with-context/issue-1851/Dockerfile
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+FROM wildwildangel/setcap-static:sha-a5c7425
+ADD test-file /usr/bin/test-file
+RUN /setcap-static cap_net_bind_service=+ep /usr/bin/test-file
diff --git a/integration/dockerfiles-with-context/issue-1851/test-file b/integration/dockerfiles-with-context/issue-1851/test-file