Make dev container compatible with podman (#178)

Following the issue described in #174 (comment).
This prevents permission issues when using the dev container with `podman`, which is running rootless.
Usage with `docker` requires explicitly passing `UID` and `GID` of the local user, which is added to the README.

Add podman command to `README.md`

Co-authored-by: NeroBurner <[email protected]>

---------

Co-authored-by: NeroBurner <[email protected]>

Author: dariusarnold

.devcontainer/Dockerfile

@@ -48,8 +48,6 @@ RUN SNIPPET="export PROMPT_COMMAND='history -a' && export HISTFILE=/commandhisto
     && chown -R $USERNAME /commandhistory \
     && echo "$SNIPPET" >> "/home/$USERNAME/.bashrc"
 
-USER ubuntu
-
 # Section for interactive compilation during docker run
 
 WORKDIR /sources

README.md

@@ -121,18 +121,24 @@ docker build -t infinisim-build .devcontainer
 
 Afterwards you can build the simulator with:
 ```sh
-docker run --rm -it -v ${PWD}:/sources infinisim-build
+docker run --rm -it -v ${PWD}:/sources --user $(id -u):$(id -g) infinisim-build
+```
+
+Note: when using rootless `podman` instead of `docker` the `--user` part can be left out.
+The command to build the simulator using `podman` is:
+```sh
+podman run --rm -it -v ${PWD}:/sources infinisim-build
 ```
 
 By default this builds the simulator using the InfiniTime files from the submodule in your `${PWD}`.
 If you want to use a different repository, you got to mount it and pass the path to the `INFINITIME_DIR` variable:
 ```sh
-docker run --rm -it -v ${PWD}:/sources -v ${PWD}/../InfiniTime:/infinitime -e INFINITIME_DIR=/infinitime infinisim-build
+docker run --rm -it -v ${PWD}:/sources -v ${PWD}/../InfiniTime:/infinitime -e INFINITIME_DIR=/infinitime  --user $(id -u):$(id -g) infinisim-build
 ```
 
 Other CMake generation and build arguments can be passed to the `GENERATE_ARGS` and `BUILD_ARGS` variables:
 ```sh
-docker run --rm -it -v ${PWD}:/sources -e GENERATE_ARGS=-DENABLE_USERAPPS="Apps::Timer,Apps::Alarm" -e BUILD_ARGS=-j16 infinisim-build
+docker run --rm -it -v ${PWD}:/sources -e GENERATE_ARGS=-DENABLE_USERAPPS="Apps::Timer,Apps::Alarm" -e BUILD_ARGS=-j16 --user $(id -u):$(id -g)  infinisim-build
 ```