Regenerated dockerfiles

Updated stable and mainline nginx versions

ci: pin GitHub Actions to full commit SHAs

Updated mainline nginx to 1.29.6 and njs to 0.9.6

Regenerated dockerfiles

alpine-slim: refactor and explain the dependencies handling

Regenerated dockerfiles

alpine-slim: make sure nginx.org repo is used

sync: drop an erroneous cli argument

sync: use docker buildx instead of docker manifest

sync: added otel image to sync

sync: convert tabs to space

sync workflow: limit to upstream repo

Updated nginx to 1.29.5 and 1.28.2, njs to 0.9.5.

alpine perl: skip acme module on arm32v6 (armhf)