cmds.secrets.CmdCompileTemplates: Support -k / --keep-going

jw-pkg secrets compile-templates iterates over all selected templates and
compiles secrets from it - unless it encounters one that can't be compiled
for whatever reason, in which case the iteration errors out without
compiling the remaining secrets.

Add a -k / --keep-going option that makes the iteration not abort over
failed compilations but continue through the remaining templates, then
report an error status at the end.

The integration test gains a good sibling of the failing fixture template:
a fail-fast run must not reach it, and a keep-going run must compile it and
still fail the command.

Signed-off-by: Jan Lindemann <jan@janware.com>
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v1.4.0

src/python/jw/pkg/cmds/secrets/CmdCompileTemplates.py

@@ -22,11 +22,17 @@ class CmdCompileTemplates(Cmd):  # export
     @override
     async def _run(self, args: Namespace) -> None:
         attrs = Attrs(args.mode, args.owner, args.group, None)
-        await self._compile_template_files(args.packages, attrs)
+        await self._compile_template_files(args.packages, attrs, args.keep_going)
 
     @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
+        parser.add_argument(
+            '--keep-going',
+            '-k',
+            action = 'store_true',
+            help = 'Compile all templates, reporting the failures at the end',
+        )
         parser.add_argument(
             '--owner', '-o', default = None, help = 'Default output file owner'
         )