ci: support variant-prefixed devcontainer Go tags#778
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The devcontainer-version-check workflow extracts the Go version from the base image tag in .devcontainer/Dockerfile. The previous regex only matched the legacy '<major>.<minor>-bookworm' tag and failed on the new variant-prefixed tags published on mcr.microsoft.com (e.g. '2-1.26-bookworm'), causing the job to exit with 'Could not parse versions'. Allow an optional leading '<digits>-' variant prefix so both tag forms are accepted.
shueybubbles
approved these changes
Jun 19, 2026
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Problem
The
devcontainer-version-checkworkflow extracts the Go version from the base image tag in.devcontainer/Dockerfile:DOCKERFILE_TAG=$(grep -oP 'devcontainers/go:\K[0-9]+\.[0-9]+' .devcontainer/Dockerfile)The regex assumes the tag starts with
<major>.<minor>(e.g.1.26-bookworm). Microsoft has begun publishing variant-prefixed tags such as2-1.26-bookworm, which the current regex does not match. When dependabot proposes that bump (#776),DOCKERFILE_TAGends up empty and the job exits with:This blocks every dependabot PR that adopts the new tag form.
Fix
Allow an optional leading
<digits>-variant prefix in the regex:DOCKERFILE_TAG=$(grep -oP 'devcontainers/go:(?:[0-9]+-)?\K[0-9]+\.[0-9]+' .devcontainer/Dockerfile)Both forms now extract the same major.minor:
1.26-bookworm1.262-1.26-bookworm1.2610-1.30-bookworm1.30No change to behavior for the legacy tag format. Once this merges, rebasing #776 should turn its
devcontainer-version-checkgreen.