base-spack: add improvements from the dev Dockerfile

* Set default value of SPACK_PACKAGES_REPO_VERSION to main
* Change granularity to generic.
* Delete repos.yaml. Use the spack repo add command.

containers/Dockerfile.base-spack

@@ -6,7 +6,7 @@ ENV SPACK_ROOT=/opt/spack
 ENV SPACK_PACKAGES_REPO_ROOT=/opt/spack_packages
 ENV GNUPGHOME=$SPACK_ROOT/opt/spack/gpg
 
-ARG SPACK_PACKAGES_REPO_VERSION
+ARG SPACK_PACKAGES_REPO_VERSION=main
 ARG SPACK_REPO_VERSION=v0.20.1
 
 LABEL au.org.access-nri.ci.spack-packages-repo-version ${SPACK_PACKAGES_REPO_VERSION}
@@ -15,10 +15,13 @@ LABEL au.org.access-nri.ci.spack-repo-version ${SPACK_REPO_VERSION}
 # Install spack
 RUN git clone -c feature.manyFiles=true https://github.com/spack/spack.git $SPACK_ROOT --branch ${SPACK_REPO_VERSION} --single-branch --depth=1
 
+RUN sed -i 's/granularity: microarchitectures/granularity: generic/' $SPACK_ROOT/etc/spack/defaults/concretizer.yaml
+
 # Enables setting Spack setup type via SHELL command
 # docker-shell:      Use for build RUN steps
 # interactive-shell: Use for interactive shell instances
 # spack-env:         Use for CMD invocations (e.g. CI runners)
+# $SPACK_ROOT/share/spack/templates/container/bootstrap-base.dockerfile:
 RUN ln -s $SPACK_ROOT/share/spack/docker/entrypoint.bash \
     /usr/local/bin/docker-shell && \
     ln -s $SPACK_ROOT/share/spack/docker/entrypoint.bash \
@@ -29,13 +32,11 @@ RUN ln -s $SPACK_ROOT/share/spack/docker/entrypoint.bash \
 # Setup Spack environment for subsequent RUN steps
 SHELL ["docker-shell"]
 
-# Bootstrap Spack
-RUN spack bootstrap now
-
 # Set up ACCESS Spack package repo
 RUN git clone  https://github.com/ACCESS-NRI/spack_packages.git ${SPACK_PACKAGES_REPO_ROOT} --branch ${SPACK_PACKAGES_REPO_VERSION} --single-branch --depth=1
 
-COPY repos.yaml $SPACK_ROOT/etc/spack/repos.yaml
+RUN spack repo add $SPACK_PACKAGES_REPO_ROOT && \
+    spack bootstrap now
 
 # TODO
 # Think about setting up spack S3 build cache for CI here