docs(compose): single-definition image ref via extension field + anchor - #68
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Learned on OPS-898 (nine consumer repos): repeating an image default per
service invites drift; a top-level x-* extension field with a YAML anchor
defines image path, version variable and default tag once per compose
file. Records the two traps met in practice: anchors do not cross files
(overlays need their own), and only ${VAR:-def} catches the empty-but-set
variable that otherwise resolves :latest.
Assisted-by: claude-code:claude-fable-5
Agent-Session: https://claude.ai/code/session_01Mu33BP3JtQfKkpZkeTHLqr
Agent-Host: 0493f0
Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>
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Dependency Review✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.Scanned FilesNone |
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Adds one Compose Essentials bullet: define a shared image reference (path + version variable + default tag) once per compose file as a top-level
x-*extension field with a YAML anchor, referenced by the services viaimage: *anchor. Documents the two traps met in practice on OPS-898 across nine consumer repos: anchors are file-local (every overlay needs its own), and only${VAR:-def}also catches the empty-but-set variable — a bare omitted tag silently resolves:latest. Verification recipe viadocker compose configfor both the default and the override path.Assisted by claude-code:claude-fable-5 — Session