[ci] Added Linux build job without Unity build.

See merge request ogs/ogs!3277

[Conan] Update netcdf package.

See merge request ogs/ogs!3276

Static mesh xdmf writer

See merge request ogs/ogs!3246

[web] Added pages on how to get support and fill a bug report

See merge request ogs/ogs!3270

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[T] Format files with xmlstarlet.

See merge request ogs/ogs!3275

Also fixes the executable bit; now 644.
Replace tabs followed by xmlstarlet format:

```sh
#!/usr/bin/sh

tmpfile=$(mktemp /tmp/xmlformat.XXXXXX)

sed 's/\t/    /g' ${1} > ${tmpfile} && mv ${tmpfile} ${1}
xmlstarlet fo -s 4 ${1} > ${tmpfile} && mv ${tmpfile} ${1}

rm -rf ${tmpfile} # if something goes wrong
```

Otherwise we get illegal instructions when compiling OGS when
the image was built on e.g. envinf2.

Reverted custom naming for xdmf libs.
Added Iconv as a dependency (dependency of libxml2).

Hydro-mechanical drainage of an excavation

See merge request ogs/ogs!3269

[PL/CT] Add postTimeStep interface

See merge request ogs/ogs!3262

Publish Docker container

See merge request ogs/ogs!3271

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