Fixed multi-stage docker build mamba env copy paths

[jacquayj]

Resolves error:

=> ERROR [stage-1 4/9] COPY --from=builder --chown=appuser:appuser /home/appuser/micromamba /home/appuser/micromamba                                                                                                                                                   0.0s
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 > [stage-1 4/9] COPY --from=builder --chown=appuser:appuser /home/appuser/micromamba /home/appuser/micromamba:
------
Dockerfile:43
--------------------
  41 |     
  42 |     # Copy the Conda environment and application code from the builder stage
  43 | >>> COPY --from=builder --chown=$APPUSER:$APPUSER $HOME/micromamba $HOME/micromamba
  44 |     COPY --from=builder --chown=$APPUSER:$APPUSER $HOME/bin $HOME/bin
  45 |     COPY --from=builder --chown=$APPUSER:$APPUSER $HOME/$DIR_NAME $HOME/$DIR_NAME
--------------------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 9428aca3-383b-4a6f-862c-d3eef5b31344::mi9m9scluvmxcsatnrz0ge8p4: "/home/appuser/micromamba": not found

View build details: docker-desktop://dashboard/build/desktop-linux/desktop-linux/8inf24d4zcpc8zj0rktkm6zcx

I suspect the behavior of micromamba changed since it wasn't pinned to a particular version:

# Install micromamba
RUN curl -Ls https://micro.mamba.pm/api/micromamba/linux-64/latest | tar -xj bin/micromamba

• Updated Dockerfile