[Snyk] Security upgrade ubuntu from focal to rolling

[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

• capi-workspace-docker/Dockerfile

We recommend upgrading to ubuntu:rolling, as this image has only 16 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
	****	Incorrect Default Permissions SNYK-UBUNTU2004-LIBZSTD-1082292	No Known Exploit
	****	Incorrect Default Permissions SNYK-UBUNTU2004-LIBZSTD-1082296	No Known Exploit
	300	Information Exposure SNYK-UBUNTU2004-SYSTEMD-582552	No Known Exploit
	300	Information Exposure SNYK-UBUNTU2004-SYSTEMD-582552	No Known Exploit

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[linux-foundation-easycla[bot]]

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/177519576

The labels on this github issue will be updated when the story is started.