Move erlang installation to base image

stack/base-with-services/Dockerfile

@@ -18,18 +18,16 @@ RUN mamba create -p /opt/conda/envs/aiida-core-services --yes \
 
 # Install RabbitMQ in a dedicated conda environment.
 # If the architecture is arm64, we install the default version of rabbitmq provided by the generic binary,
-# # https://www.rabbitmq.com/install-generic-unix.html the version needs to be compatible with system's erlang version.
+# https://www.rabbitmq.com/install-generic-unix.html the version needs to be compatible with system's erlang version.
+# Note that system erlang from arm64 is already installed in the base image, together with other APT dependencies
+# to save build time.
 RUN if [ "$TARGETARCH" = "amd64" ]; then \
      mamba install -p /opt/conda/envs/aiida-core-services --yes \
           rabbitmq-server=3.8.14  && \
      mamba clean --all -f -y && \
      fix-permissions "${CONDA_DIR}" && \
      fix-permissions "/home/${NB_USER}"; \
 elif [ "$TARGETARCH" = "arm64" ]; then \
-     apt-get update && apt-get install -y --no-install-recommends  \
-          erlang && \
-     rm -rf /var/lib/apt/lists/* && \
-     apt-get clean all && \
      export RMQ_VERSION=3.9.13 && \
      wget -c https://github.com/rabbitmq/rabbitmq-server/releases/download/v${RMQ_VERSION}/rabbitmq-server-generic-unix-${RMQ_VERSION}.tar.xz && \
      tar -xf rabbitmq-server-generic-unix-${RMQ_VERSION}.tar.xz && \
@@ -38,7 +36,7 @@ elif [ "$TARGETARCH" = "arm64" ]; then \
      fix-permissions "/opt/conda/envs/aiida-core-services/rabbitmq_server-${RMQ_VERSION}" && \
      ln -sf /opt/conda/envs/aiida-core-services/rabbitmq_server-${RMQ_VERSION}/sbin/* /opt/conda/envs/aiida-core-services/bin/; \
 else \
-   echo "Unknown architecture: ${TARGETARCH}."; \
+     echo "Unknown architecture: ${TARGETARCH}."; \
 fi
 
 # Configure AiiDA profile.

stack/base/Dockerfile

@@ -11,6 +11,15 @@ USER root
 # rsync: needed to support the new AiiDA backup command
 # povray: rendering engine used in aiidalab-widgets-base
 ENV EXTRA_APT_PACKAGES "curl povray rsync build-essential"
+
+# For ARM64 we need to install erlang as it is not available on conda-forge
+# (this is needed later as rabbitmq dependency in base-with-services image,
+# but we install it here so that we don't have to invoke apt multiple times.
+ARG TARGETARCH
+RUN if [ "$TARGETARCH" = "arm64" ]; then \
+        EXTRA_APT_PACKAGES="erlang "${EXTRA_APT_PACKAGES} \
+    fi
+
 RUN apt-get update --yes && \
     apt-get install --yes --no-install-recommends ${EXTRA_APT_PACKAGES} && \
     apt-get clean && rm -rf /var/lib/apt/lists/*

stack/full-stack/Dockerfile

@@ -9,16 +9,6 @@ COPY --from=base /opt/config-quick-setup.yaml /opt/
 COPY --from=base "${CONDA_DIR}/envs/aiida-core-services" "${CONDA_DIR}/envs/aiida-core-services"
 COPY --from=base /usr/local/bin/before-notebook.d /usr/local/bin/before-notebook.d
 
-# This is needed because we use multi-stage build,
-# the erlang package is not available after the first stage.
-ARG TARGETARCH
-RUN if [ "$TARGETARCH" = "arm64" ]; then \
-    # Install erlang.
-    apt-get update --yes && \
-    apt-get install --yes --no-install-recommends erlang && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*; \
-fi
-
 RUN fix-permissions "${CONDA_DIR}"
 RUN fix-permissions "/home/${NB_USER}/.aiida"