Fix CI use of txm and its need for a new Node

[adamnovak]

Changelog Entry

To be copied to the draft changelog by merger:

• vg autoindex now produces valid FAI indexes when the sequence name lines contain tabs.
• vg autoindex has best-practices options set correctly for GBWT construction.
• PKG_CONFIG_PATH is now forwarded to vcflib build
• Gitlab build now runs with Node 14

Description

This pulls in #3287 and #3292 and should fix Gitlab CI by upgrading node beyond what Ubuntu LTS ships.

[adamnovak]

It looks like we have another CI-breaking bug, which is that, successful docker login notwithstanding, Quay is refusing our image pushes:

#25 [run 4/5] COPY --from=build /vg/scripts/* /vg/scripts/
#25 sha256:5c4cafc6e5f8afcdeb7eb405481078f29dc92c25023044149551c4ee149f72b4
#25 CACHED

#26 [run 5/5] COPY --from=build /vg/deps/FlameGraph /vg/deps/FlameGraph
#26 sha256:cbaac0c9b60e7d1260dc0029981d7e32ec3939656157c42a26852ded5589a582
#26 CACHED

#27 exporting to image
#27 sha256:e8c613e07b0b7ff33893b694f7759a10d42e180f2b4dc349fb57dc6b71dcab00
#27 exporting layers done
#27 exporting manifest sha256:fda2303780903eb065b38b64236c9351be993724739b1dcc2c1c9283ce14ae45 done
#27 exporting config sha256:29f0b4e36410a2682c6aca9355b01eb6fd0f47feb5a9f6daf82e5fc73dff4f4e done
#27 pushing layers
#27 pushing layers 0.5s done
#27 pushing manifest for quay.io/vgteam/vg:ci-2989-3654fec4b54befeb506e7d379cb5f8ff0c61e7f1
#27 pushing manifest for quay.io/vgteam/vg:ci-2989-3654fec4b54befeb506e7d379cb5f8ff0c61e7f1 0.6s done
#27 ERROR: failed commit on ref "manifest-sha256:fda2303780903eb065b38b64236c9351be993724739b1dcc2c1c9283ce14ae45": unexpected status: 401 UNAUTHORIZED

I have no idea why they are doing this; it doesn't seem to happen every time, and it doesn't seem to be at all related to a long build time like all the other issues I can find complaining that their logins expired.

[jeizenga]

Lovely.