ci(e2e): scope login to push

[crazy-max]

relates to https://github.com/docker/build-push-action/actions/runs/26235548000/job/77207589758#step:11:317

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   1 |     # syntax=docker/dockerfile:1
   2 | >>> FROM --platform=$BUILDPLATFORM golang:alpine AS build
   3 |     
   4 |     ARG TARGETPLATFORM
--------------------
ERROR: failed to build: failed to solve: failed to copy: httpReadSeeker: failed open: unexpected status from GET request to https://registry-1.docker.io/v2/library/alpine/manifests/sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11: 429 Too Many Requests
toomanyrequests: You have reached your pull rate limit as '***': dckr_jti_N2ET7FEmmANT7CaMgfMLu5Rs4JQ=. You may increase the limit by upgrading. https://www.docker.com/increase-rate-limit