Forcibly remove existing manifest before creating a new one

[der-eismann]

Description

We are using this action to build multiarch images on our own runners. However when a build is running on the same runner multiple times we get the following error:

/bin/buildah manifest create 12345678901.dkr.ecr.eu-west-1.amazonaws.com/base-image-java:9-move-to-gha
error creating image to hold manifest list: 
  image name "12345678901.dkr.ecr.eu-west-1.amazonaws.com/base-image-java:9-move-to-gha" is already associated
  with image "b13b58c4add1afbad60f0062ad3beb2d5fc5c5b11d6f0881213214dd4d6e10de": that name is already in use

This change executes a manifest rm and ignores the return code. Originally I was planning to do manifest exists and then conditionally remove, but unfortunately this feature exists only in podman and not in buildah (yet).

Related Issue(s)

Fixes #102

Checklist

• [ ] This PR includes a documentation change

• [x] This PR does not need a documentation change

• [ ] This PR includes test changes

• [ ] This PR's changes are already tested

• [x] This change is not user-facing
• [ ] This change is a patch change
• [ ] This change is a minor change
• [ ] This change is a major (breaking) change

Changes made

• Force-remove existing manifest before creating a new one

[divyansh42]

@der-eismann Thanks for the PR! Could you please rebase your PR.

[der-eismann]

@der-eismann Thanks for the PR! Could you please rebase your PR.

Done!

[der-eismann]

@divyansh42 are you gone again?

[divyansh42]

@der-eismann could please take a look at lint errors?

[der-eismann]

@der-eismann could please take a look at lint errors?

Done

[der-eismann]

@divyansh42 can you please merge this?

[divyansh42]

@der-eismann created a release for the same. You can use this in v2 or v2.12 Thanks!