Fix docker build

Due to changes in the ISAR image the build has to change to use
multistage builds.

Dockerfile.Isar

@@ -1,10 +1,11 @@
-FROM ghcr.io/equinor/isar:latest
+FROM python:3.10-slim as builder
 
-ARG ROBOT_REPOSITORY_CLONE_URL=https://github.com/equinor/isar-turtlebot.git
+RUN python -m venv --copies /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
 
-RUN pip install git+${ROBOT_REPOSITORY_CLONE_URL}@main
+COPY . .
+RUN pip install .
 
-RUN useradd -ms /bin/bash --uid 1001 isar
-RUN chown -R 1001 /app
-RUN chmod 755 /app
-USER 1001
+FROM ghcr.io/equinor/isar:latest
+COPY --from=builder /opt/venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"