The prior postUpgradeTasks command 'sops -d ... && sops -e' was wrong:
Renovate has no preUpgradeTasks hook, and postUpgradeTasks runs AFTER
Renovate rewrites the file. These values.yaml are SOPS documents whose
sops.mac authenticates the whole file, so editing a plaintext image.tag
invalidates the MAC and 'sops -d' then fails (data-integrity error). The
claimed decrypt-after-bump therefore could never work.
boot.sh now decrypts every values.yaml in the checkout BEFORE Renovate
extracts/edits them, committing the decrypted tree locally (never pushed,
so no plaintext secrets enter remote git). postUpgradeTasks is reduced to
'sops -e -i' only (the file is already plaintext when Renovate edits it).
Validated: kustomize build passes for the whole kubernetes/ tree.
