Prep work for derby tests

external/derby/README.md

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+# External Derby Tests
+
+Derby tests are a part of the external third-party application tests that help verify that the AdoptOpenJDK binaries are *good* by running a variety of Java applications inside of Docker containers. AdoptOpenJDK/openjdk-tests/[Issue #172](https://github.com/AdoptOpenJDK/openjdk-tests/issues/172) lists the applications that we have initially targeted to best exercise the AdoptOpenJDK binaries.  For each application, we choose to run a selection of their functional tests.
+
+## Running External derby tests locally
+To run any AQA tests locally, you follow the same pattern:
+
+0. Ensure your test machine is set up with [test prereqs](https://github.com/AdoptOpenJDK/openjdk-tests/blob/master/doc/Prerequisites.md).  For external tests, you do need Docker installed.
+
+1. Download/unpack the SDK that you want to test to your test machine
+1. `export TEST_JDK_HOME=</pathToWhereYouInstalledSDK>` 
+1. `git clone https://github.com/AdoptOpenJDK/openjdk-tests.git` 
+1. `cd openjdk-tests`
+1. `./get.sh`
+1. `cd TKG`
+1. export required environment variables, BUILD_LIST and EXTRA_DOCKER_ARGS (example: `export BUILD_LIST=external/derby` and `export EXTRA_DOCKER_ARGS="-v $TEST_JDK_HOME:/opt/java/openjdk"`
+1. `make compile`              (This fetches test material and compiles it, based on build.xml files in the test directories)
+1. `make _derby_test`   (When you defined BUILD_LIST to point to a directory in [openjdk-tests/external](https://github.com/AdoptOpenJDK/openjdk-tests/tree/master/external), then this is a testCaseName from the playlist.xml file within the directory you chose)
+
+When [running these from the command-line](https://github.com/AdoptOpenJDK/openjdk-tests/blob/master/doc/userGuide.md#local-testing-via-make-targets-on-the-commandline), these tests are grouped under a make target called 'external', so 'make external' would run the entire set of tests found in the openjdk-tests/external directory.  This is unadvisable!  Limit what you compile and run, BUILD_LIST=external/`<someSubDirectory>`, and TARGET=`<testCaseNameFromSubdirPlaylist>` 
+
+These tests run regularly and results can be found in [TRSS Third Party Application view](https://trss.adoptopenjdk.net/ThirdPartyAppView).

external/derby/test.properties

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+github_url="https://github.com/apache/derby.git"
+script="derby-test.sh"
+home_path="\${WORKDIR}/derby"
+tag_version="trunk"
+ant_version="1.10.6"
+debian_packages="git wget tar"
+debianslim_packages="${debian_packages}"
+ubuntu_packages="${debian_packages}"
+alpine_packages="bash git wget tar"
+centos_packages="git wget tar"
+clefos_packages="${centos_packages}"
+ubi_packages="git wget tar"
+ubi_minimal_packages="${ubi_packages}"