hadolint: version bump to 2.4.0

- bump Hadolint version to 2.4.0
- change to debian based image
- add common config options
- expand integration tests for new options

fixes: https://github.com/hadolint/hadolint-action/issues/5
fixes: https://github.com/hadolint/hadolint-action/issues/8
fixes: https://github.com/hadolint/hadolint-action/issues/17
fixes: https://github.com/hadolint/hadolint-action/issues/18
fixes: https://github.com/hadolint/hadolint-action/issues/31

testdata/hadolint.yaml

@@ -0,0 +1 @@
+failure-threshold: error

testdata/info.Dockerfile

@@ -0,0 +1,5 @@
+FROM debian:buster
+
+# info level warning expected here:
+RUN echo "Hello"
+RUN echo "World"

testdata/warning.Dockerfile

@@ -0,0 +1,4 @@
+FROM debian:buster
+
+# emits an info and a warning level violation.
+RUN apt-get install foo