Added multiarch build support for Teleport

[fheinecke]

This is part two of a series of PRs updating drone/dronegen to support multiarch builds.

The primary purpose of this PR is to add multiarch Teleport container images. This includes amd64, arm, and arm64 images under the $MAJOR_VERSION tag on each release.

Due to the complexity of how we handle building and publishing container images this PR includes a number of other changes:

• Removed old/unneeded Makefile targets that pertain to building images.
• Reduced the number of Dockerfiles that are involved with building images from four to one consistent, unified file.
• Moved all Teleport OSS/Enterprise/FIPS CI/CD related image building logic into dronegen and the new "unified" Dockerfile. Previously this logic was spread across two repos, two makefiles, a few dozen makefile targets, four Dockerfiles, Dronegen, and lots of manual entries in .drone.yml
• Updated makefiles to use the new Dockerfile
• Refactored several makefile targets to support local archive building, deb building, and image building from source

After this PR is merged I will open a final PR for Teleport Lab.

Related PR:

• Added multiarch build support for teleport-operator #16688
• Added multiarch Teleport container images #15514
• Request: ARM container builds #3384

Test runs prior to merging PR:

• Tag logic with empty container repo (v1.2.3-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17046
• Tag logic again with the same tag, via retag (v1.2.3-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17048
• Promote logic with exit due to prerelease (v1.2.3-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17050
• Promote logic with empty container repos (v1.2.3-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17049
• Promote logic with the same tag, via restart (v1.2.3-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17051
• Cron logic test (v1.2.4-fred.11): https://drone.platform.teleport.sh/gravitational/teleport/17059

[github-actions]

@fheinecke - this PR is large and will require admin approval to merge. Consider breaking it up into a series smaller changes.

[fheinecke]

Note to reviewers: I'll be deploying a series of commits to test this PR in Drone itself. For now please ignore any commits after d288768.

This also removes the following pipelines:

• build-docker-images
• promote-docker-ecr
• promote-docker-quay

The following pipelines have been manually edited (not in dronegen):

• teleport-docker-cron-ecr
• teleport-docker-cron

[fheinecke]

Found at least one logic bug related to building image at tag time. Working on it now. Fixed

[fheinecke]

@wadells @r0mant @logand22 This is ready for a (hopefully) final review. All testing changes have been reverted. See PR main comment for a link to drone test runs. Images are also available for testing here:

• https://quay.io/repository/fred_heinecke/teleport-operator
• https://quay.io/repository/fred_heinecke/teleport
• https://quay.io/repository/fred_heinecke/teleport-ent
• Public ECR in the teleport-dev AWS account
• Privte ECR in the teleport-dev AWS account in us-east-2

Walt is on leave and his feedback was implemented.