To be able to push to git using an ssh url in a DevContainer, ssh is needed in the docker image.
Make sure to add this change to .devcontainer/iobroker/Dockerfile:
FROM iobroker/iobroker:latest
RUN ln -s /opt/iobroker/node_modules/ /root/.node_modules
+
+# Needed to use git-ssh in devcontainer
+RUN apt-get update \
+ && apt-get -y --no-install-recommends install openssh-client \
+ && apt-get clean && rm -rf /var/lib/apt/lists/*