The primary intent is to make JSON parsing explicitly opt-in rather than
using heuristics to determine intent.
With some exceptions, given bake variable `VAR`, an environment variable
`VAR_JSON` must be used to provide JSON content. The value in
`VAR_JSON` will be ignored when:
* a bake built-in of that same name exists
* a user-provided variable of that same name exists
* typing (attribute `type`) is not present
The first is unlikely to happen as built-ins will likely start with
`BUILDX_BAKE_`, an unlikely prefix for end users. The second may be a
real scenario, where users have `VAR_JSON` dedicated to accepting a
string with JSON content and decoding via an HCL function. This will
continue to work as-is, but can be simplified by removing the variable
from their bake file (`VAR_JSON`) and applying typing (to `VAR`).
Signed-off-by: Roberto Villarreal <rrjjvv@yahoo.com>
Roberto Villarreal
956fc0c9eb