`${SOME_VAR%pattern}` was turning into `SOME_VAL%pattern}` which the shell would then balk at.
I've updated the `TOKEN_ENV_INTERPOLATION` regex to account for this (ie, if `${` is used, it _must_ also match the closing `}`), and renamed the variable to not be exported (since it's not used outside the function following it).
I also added comments for the bits of `tokenEnvInterpolation` so they're easier to follow. 😄
Signed-off-by: Andrew Page <admwiggin@gmail.com>
Upstream-commit: 24189b2c36985f8345691fa6ec2c0766cfc133a7
Component: engine
Addresses #8057
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
Upstream-commit: 4119c9d7d955757092adc3410da8d75f972bd3c1
Component: engine
