Adds env-var fallbacks for global flags, mirroring the existing
HELMFILE_ENVIRONMENT / HELMFILE_KUBE_CONTEXT pattern:
* --helm-binary -> HELMFILE_HELM_BINARY
* --kustomize-binary -> HELMFILE_KUSTOMIZE_BINARY
* --log-level -> HELMFILE_LOG_LEVEL
* --debug -> HELMFILE_DEBUG (expecting "true" lower case)
* --quiet -> HELMFILE_QUIET (expecting "true" lower case)
* --no-color -> HELMFILE_NO_COLOR (expecting "true" lower case),
additionally honors NO_COLOR per no-color.org
(any non-empty value disables color)
Flag values still take precedence; env vars are consulted only when the
flag is unset. The string-flag default values ("helm", "kustomize",
"info") move into the accessor methods so the env-var fallback can
actually trigger when no flag is passed.
Signed-off-by: Dominik Schmidt <dev@dominik-schmidt.de>
987172454e