Update guidance regarding default spack ref

Author: CodeGat

.github/workflows/ci-github-hosted.yml

@@ -66,6 +66,7 @@ on:
       spack-ref:
         required: false
         type: string
+        # Default spack version - must be changed across the Dockerfile as well
         default: releases/v1.1
         description: |
           The branch, tag, or commit SHA of the access-nri/spack repository to use.

.github/workflows/ci.yml

@@ -66,6 +66,7 @@ on:
       spack-ref:
         required: false
         type: string
+        # Default spack version - must be changed across the Dockerfile as well
         default: releases/v1.1
         description: |
           The branch, tag, or commit SHA of the access-nri/spack repository to use.

containers/Dockerfile

@@ -127,6 +127,7 @@ RUN zypper ref \
 FROM base-os-$OS AS base-spack
 
 ARG SPACK_GIT_URL=https://github.com/ACCESS-NRI/spack.git
+# Default spack version - must be changed across ci*.yml as well
 ARG SPACK_VERSION=v1.1
 ARG SPACK_REPO_VERSION=releases/${SPACK_VERSION}
 ARG SPACK_CONFIG_REPO_VERSION=main