The Generator struct contains an internal envMap field that caches
environment variable positions for performance optimization when adding
environment variables. This map is critical for the proper operation of
the AddProcessEnv() and AddMultipleProcessEnv() methods, which rely on
it to efficiently detect and update duplicate environment variables.

The previous code directly instantiated a Generator struct literal,
which leaves the envMap field as nil (the zero value for maps in Go).
When methods like AddProcessEnv() are subsequently called, they attempt
to access g.envMap[key], which will work on a nil map for reads but
creates a bug: the code path at line 543 tries to assign to g.envMap,
which will panic with "assignment to entry in nil map".

While the current code path in createContainerPlatform() doesn't
immediately call methods that would trigger this panic, the bug
represents a latent defect that could cause runtime panics if future
changes call environment variable manipulation methods on this Generator
instance.

Signed-off-by: Andreas Karis <[email protected]>