use tar not echo
@@ -4,5 +4,5 @@ FROM adoptopenjdk/openjdk11:alpine
ARG TAR_FILE
-RUN export=tarfile`ls ${TAR_FILE}` && echo $tarfile -C /home/runner/work/tessera/dist
+RUN export=tarfile`ls ${TAR_FILE}` && tar xvzf $tarfile -C /home/runner/work/tessera/dist
ENTRYPOINT ["/home/runner/work/tessera/dist/bin/tessera"]
