feat(misconf): normalize CreatedBy strings for COPY and ADD instructions for podman (buildah) images

[nikpivkin]

Example dockerfile:

FROM scratch
COPY . ./files
ADD readme readme

Build image via podman build . --inherit-labels=false --tag myimage:test

History:

❯ podman history myimage:test --format "{{.CreatedBy}}" --no-trunc
/bin/sh -c #(nop) ADD file:24d346633efc860b5011cefa5c0af73006e74e5dfb3c5c0e9cb0e90a927931e1 in readme |inheritLabels=false
/bin/sh -c #(nop) COPY dir:55f494488e3d5d72974d2ecacf26a1989faabb3185b66505f2bb02394a6505ae in ./files |inheritLabels=false

Code for building a string in buildah: https://github.com/containers/buildah/blob/5a02e74b5d0f01e4d68ea0dcdbf5f5f444baa68f/imagebuildah/stage_executor.go#L1982

Discussed in #8943

[nikpivkin]

After investigating this issue, I have found that only the string for the COPY instruction for the buildah and docker legacy builders needs to be cleaned up (removing in). We also need to investigate how the ||inheritLabels=false suffix might affect the checks that are added when the --inherit-labels flag is used in the buildah backend.