Fix Install Script Permissions for Those Using Dev Containers

[callbacked]

Cloning the repo for the first time and spinning it up as a dev container using the predefined ./devcontainer folder led me to permission denied errors for:

• install-vscode.sh

 => => transferring dev_containers_feature_content_source: 24.59kB         0.0s
 => [dev_container_auto_added_stage_label 1/7] FROM mcr.microsoft.com/dev  0.0s
 => CACHED [dev_container_auto_added_stage_label 2/7] ADD install-vscode.  0.0s
 => ERROR [dev_container_auto_added_stage_label 3/7] RUN /root/install-vs  0.6s
------
 > [dev_container_auto_added_stage_label 3/7] RUN /root/install-vscode.sh:
0.499 /bin/sh: 1: /root/install-vscode.sh: Permission denied
------
Dockerfile-with-features:6
--------------------
   4 |     
   5 |     ADD install-vscode.sh /root/
   6 | >>> RUN /root/install-vscode.sh
   7 |     
   8 |     RUN git config --system codespaces-theme.hide-status 1
--------------------
ERROR: failed to solve: process "/bin/sh -c /root/install-vscode.sh" did not complete successfully: exit code: 126
[6720 ms] Error: Command failed: docker buildx build --load --build-arg BUILDKIT_INLINE_CACHE=1 -f /tmp/devcontainercli-orion/container-features/0.56.0-1726624192810/Dockerfile-w

• post-create.sh

305318 ms] Start: Run in container: /bin/sh -c ./.devcontainer/post-create.sh
/bin/sh: 1: ./.devcontainer/post-create.sh: Permission denied
[305375 ms] postCreateCommand failed with exit code 126. Skipping any further user-provided commands.
Done. Press any key to close the terminal.

For install-vscode.sh, what I did is add an entry to add exec permissions in the Dockerfile.

For post-create.sh, since its not referenced in the Dockerfile, I directly applied exec permissions to the file through chmod +x. So 644 to 755.

[andrewpareles]

We shouldn't need to modify this file. Users with permission errors should be able to chmod files themselves.
If you think this is a problem that other people will have, please post your solution in the discord support channel.