Containerfile: Use version var, entrypoint is bash

Use simpler version enviroment variable, to standarize container
versioning internally. Set entrypoint to bash by default, since is the
most desired behaviour when running locally, being entrypoint.sh only
useful on systemd files, which can set the `--entrypoint` anyway.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

container/Containerfile

@@ -1,6 +1,6 @@
 FROM opensuse/leap:16.0
 
-ENV runner_labels=repo-only,v4
+ENV version=v4
 ARG runner_version=2.331.0
 ARG runner_version_sha=5fcc01bd546ba5c3f1291c2803658ebd3cedb3836489eda3be357d41bfcf28a7
 ARG bashrc=https://raw.githubusercontent.com/analogdevicesinc/doctools/refs/heads/ci/bashrc
@@ -54,5 +54,5 @@ WORKDIR /home/runner
 RUN curl -o .bashrc -L ${bashrc} ; \
     chmod +x .bashrc
 
-ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+ENTRYPOINT ["/bin/bash"]