Add swh-utils image to help build init-container image

We have currently some init-container image which requires extra dependencies to do their job. They currently pull the debian:bullseye and installs those prior to run the script.

Building this image (and declaring it there) will simplify and accelerate the process of initialization.

The image is slighly bigger than the default (+26MB).

$ docker image ls swh-utils:latest
REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
swh-utils    latest    18fc5c089314   6 seconds ago   150MB
$ docker image ls debian:bullseye
REPOSITORY   TAG        IMAGE ID       CREATED       SIZE
debian       bullseye   873181a41b99   2 weeks ago   124MB

Refs. sysadm-environment#5179 (closed)

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• 70f9ad58 - Add swh-utils image to help build init-container image

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indeed:

> docker history test
IMAGE          CREATED         CREATED BY                                      SIZE      COMMENT
aa48beb1d9d0   4 minutes ago   RUN /bin/sh -c apt-get -y update &&     apt-…   26.5MB    buildkit.dockerfile.v0
<missing>      2 weeks ago     /bin/sh -c #(nop)  CMD ["bash"]                 0B
<missing>      2 weeks ago     /bin/sh -c #(nop) ADD file:71543995e4d314b0c…   124MB

For this kind of application, perhaps the bookwork-slim image can be enough:

> docker history test
IMAGE          CREATED         CREATED BY                                      SIZE      COMMENT
e45ca3c94beb   5 seconds ago   RUN /bin/sh -c apt-get -y update &&     apt-…   47.4MB    buildkit.dockerfile.v0
<missing>      2 weeks ago     /bin/sh -c #(nop)  CMD ["bash"]                 0B
<missing>      2 weeks ago     /bin/sh -c #(nop) ADD file:d261a6f6921593f1e…   74.8MB

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• 901b10f4 - Add new swh-utils image for init-container image

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merged