[openstreetmap/openstreetmap-website] Pull docker ruby version into arg (PR #6354)

[rkoeze]

rkoeze left a comment (openstreetmap/openstreetmap-website#6354)

Here are a couple of examples of how parameterizing the entire Docker image will break the build: 
* rubylang/ruby:3.2-jammy
```
6.690 E: Package 'firefox-esr' has no installation candidate
------
failed to solve: process "/bin/sh -c apt-get update   && apt-get install --no-install-recommends -y   build-essential   curl   default-jre-headless   file   git-core   gpg-agent   libarchive-dev   libffi-dev   libgd-dev   libpq-dev   libsasl2-dev   libvips-dev   libxml2-dev   libxslt1-dev   libyaml-dev   locales   postgresql-client   tzdata   unzip   nodejs   npm   osmosis   ca-certificates   firefox-esr" did not complete successfully: exit code: 100
```
* ruby:3.2-alpine3.2
```
 > [web  2/10] RUN apt-get update   && apt-get install --no-install-recommends -y   build-essential   curl   default-jre-headless   file   git-core   gpg-agent   libarchive-dev   libffi-dev   libgd-dev   libpq-dev   libsasl2-dev   libvips-dev   libxml2-dev   libxslt1-dev   libyaml-dev   locales   postgresql-client   tzdata   unzip   nodejs   npm   osmosis   ca-certificates   firefox-esr:
0.083 /bin/sh: apt-get: not found
```

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