feat: add workdir to dockerfile (#3186)

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## Overview

This should be a non-breaking change.

This only changes the work directory when the container is started. This
means that if you want to execute a command in a running container, it
will be automatically in that directory instead of '/'. This improves
maintaining and debugging our environments.

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---------

Signed-off-by: Smuu <[email protected]>

Dockerfile

@@ -57,6 +57,8 @@ COPY --from=builder /celestia-app/build/celestia-appd /bin/celestia-appd
 COPY --chown=${USER_NAME}:${USER_NAME} docker/entrypoint.sh /opt/entrypoint.sh
 # Set the user to celestia.
 USER ${USER_NAME}
+# Set the working directory to the home directory.
+WORKDIR ${CELESTIA_HOME}
 # Expose ports:
 # 1317 is the default API server port.
 # 9090 is the default GRPC server port.

docker/Dockerfile_txsim

@@ -53,6 +53,9 @@ COPY --chown=${USER_NAME}:${USER_NAME} docker/txsim.sh /opt/entrypoint.sh
 
 USER ${USER_NAME}
 
+# Set the working directory to the home directory.
+WORKDIR ${CELESTIA_HOME}
+
 # grpc, rpc, api ports
 EXPOSE 26657 1317 9090