[Snyk] Security upgrade ubuntu from latest to groovy-20210614

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile

We recommend upgrading to ubuntu:groovy-20210614, as this image has only 18 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	321	Improper Check for Dropped Privileges SNYK-UBUNTU2004-BASH-581100	Mature
	371	CVE-2021-3580 SNYK-UBUNTU2004-NETTLE-1303240	No Known Exploit
	371	CVE-2021-3580 SNYK-UBUNTU2004-NETTLE-1303240	No Known Exploit
	300	Authentication Bypass SNYK-UBUNTU2004-SYSTEMD-1290722	No Known Exploit
	300	Authentication Bypass SNYK-UBUNTU2004-SYSTEMD-1290722	No Known Exploit

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[codecov]

Codecov Report

Merging #291 (e8111f2) into main (85268ae) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage   33.52%   33.52%           
=======================================
  Files          40       40           
  Lines        2213     2213           
=======================================
  Hits          742      742           
  Misses       1377     1377           
  Partials       94       94