TCE Release v0.6.0-rc.1

Changelog:

• Adds support for IPv6 networks with Calico CNI on a vSphere provider (#737, @adobley)
• Akoo template bug fix (#732, @iXinqi)
• Bump versions(alertmanager) and Add configurations(prometheus, grafana) and auto certmanager certs (#750, @akodali18)
• Bumps go mod for cluster-api force push (#751, @jpmcb)
• Doc: Troubleshooting doc template (#743, @kcoriordan)
• Doc: Update pkg readmes (#738, @kcoriordan)
• Enable the ability to create a release from a release branch (#829, @dvonthenen)
• External-dns addon is updated to v0.8.0 (#757, @flawedmatrix)
• Fix CI on main - md linting issues with licensing comments in go files (#811, @jpmcb)
• Fix akodeploymentconfig templates (#740, @iXinqi)
• Fix alertmanager config as secret instead of ConfigMap. Modify defaults for Grafana (#835, @akodali18)
• Fix broken build with missing cluster-api dependencies (#768, @jpmcb)
• Fix multi-branch support (#866, @dvonthenen)
• Fix rc/beta/alpha tags (#860, @dvonthenen)
• Pinniped package provides authentication/identity services (#731, @benjaminapetersen)
• Provide the correct branding for management cluster plugin (#858, @dvonthenen)
• Run build-all in check-build github action (#792, @jpmcb)
• Standalone-cluster create using kickstart UI detects clusterconfig file (#698, @jpmcb)
• Update kapp controller to available sha on develop branch (#789, @jpmcb)
• Update kapp-controller to v0.20.0-rc.1 (#783, @shyaamsn)
• Update package versions for 0.5.0 (#538, @seemiller)
• [AVI] Fix three bugs in ako-operator templates (#798, @iXinqi)