Commit
2437f4fe8e0689c20feaf2f1129983ca2cf16e79
by Oliver Smithdebian-buster-jenkins: install ccache
Make ccache available inside debian-buster-jenkins. An upcoming osmo-ci
patch will make use of it in gerrit-verification and master jobs. With
this docker-playground patch alone it's not used yet since
/usr/lib/ccache is not in the default PATH.
Related: OS#5848
Change-Id: I164c7835f99436e8d768a864f36118eaf799d109
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