Add labels to container images when build with build_images.sh

[dklimpel]

Checklist

• make test-all (UNIX) passes. CI will also test this
• unit and/or integration tests are included (if applicable)
• documentation is changed or added (if applicable)

Description of change

Adds the same labels to container images when building build_images.sh images as CI builds images (#901).

for comparison

$ skopeo inspect docker://ghcr.io/goss-org/goss:master
{
    "Name": "ghcr.io/goss-org/goss",
    "Digest": "sha256:34d8b4e7701f6ce05d48295f41b551036a4ab41fcc90a95117bc2167af6a75e0",
    "RepoTags": [
        "master"
    ],
    "Created": "2024-07-09T13:21:34.663165177Z",
    "DockerVersion": "",
    "Labels": {
        "org.opencontainers.image.created": "2024-07-09T13:20:52.013Z",
        "org.opencontainers.image.description": "Quick and Easy server testing/validation",
        "org.opencontainers.image.licenses": "Apache-2.0",
        "org.opencontainers.image.revision": "05f03a36ef6575b12e85670f3430a5e6e55dd547",
        "org.opencontainers.image.source": "https://github.com/goss-org/goss",
        "org.opencontainers.image.title": "goss",
        "org.opencontainers.image.url": "https://github.com/goss-org/goss",
        "org.opencontainers.image.version": "master"
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Layers": [
        "sha256:b84a74cde5af5c5199bfc2ce2a8c8951a29a7716d17327e923f1a14c870a858b",
        "sha256:6c78e6c5d5083b0f92470315174d8036c0290cfb9bde21461ece9ead8fcd9705",
        "sha256:125d8e7bce64fb32407c2d3b4cdf168300ec048397dcdde32dddc821fef3a5a4"
    ],
    "Env": [
        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
    ]
}

[aelsabbahy]

Interesting, so these end up in the image, but don't impact the checksum?

[dklimpel]

Interesting, so these end up in the image, but don't impact the checksum?

Yes, docker adds the labels after building the image. The checksum / content of the Dockerfile will not be changed.
It is possible to set labels inside the Dockerfile or during the build process.

I had thought about the topic of labels, because it might be a good step to replace the md5sum files and integrate the checksum as a label in the image.