access-om2 SPRs: change the name of the default version

[harshula]

• Originally there was only one version in each SPR. It was used to build access-om2. However, now we have more versions like access-esm1.5. By renaming version "master" to "access-om2", it is clear that is the version used to build access-om2.
• Use the new maintainers() function.

[harshula]

Testing

• Successful build of ACCESS-OM2 using https://github.com/ACCESS-NRI/ACCESS-OM2/blob/main/spack.yaml
• Successful build of ACCESS-OM2 using https://github.com/ACCESS-NRI/ACCESS-OM2/blob/main/spack.yaml and making the following changes:

@@ -9,16 +9,16 @@ spack:
   packages:
     cice5:
       require:
-        - '@git.2023.10.19'
+        - '@git.2023.10.19=access-om2'
     mom5:
       require:
-        - '@git.2023.11.09'
+        - '@git.2023.11.09=access-om2'
     libaccessom2:
       require:
-        - '@git.2023.10.26'
+        - '@git.2023.10.26=access-om2'
     oasis3-mct:
       require:
-        - '@git.2023.11.09'
+        - '@git.2023.11.09=access-om2'
     netcdf-c:
       require:
         - '@4.7.4'

[harshula]

Testing

@@ -5,7 +5,7 @@
 spack:
   # add package specs to the `specs` list
   specs:
-    - access-om2@git.2024.03.0
+    - access-om2@git.2024.03.0=access-om2
   packages:
     cice5:
       require:

[om2-version-access-om2] [root@4d585f76c0b3 opt]# spack concretize -f --reuse-deps
==> Concretized access-om2@git.2024.03.0=access-om2
...

[om2-version-access-om2] [root@4d585f76c0b3 opt]# spack install
...
==> Waiting for access-om2-git.2024.03.0=access-om2-yq2bx7bbiehmtzcowfxfmmfdusot==> Installing access-om2-git.2024.03.0=access-om2-yq2bx7bbiehmtzcowfxfmmfdusotfc36 [35/35]
==> No binary for access-om2-git.2024.03.0=access-om2-yq2bx7bbiehmtzcowfxfmmfdusotfc36 found: installing from source
==> No patches needed for access-om2
==> access-om2: Executing phase: 'install'
==> Warning: Module file /opt/release/modules/linux-rocky8-x86_64/access-om2/2024.03.0 exists and will not be overwritten
==> access-om2: Successfully installed access-om2-git.2024.03.0=access-om2-yq2bx7bbiehmtzcowfxfmmfdusotfc36
  Stage: 0.00s.  Install: 0.00s.  Post-install: 0.04s.  Total: 0.13s
[+] /opt/release/linux-rocky8-x86_64/intel-2021.2.0/access-om2-git.2024.03.0_access-om2-yq2bx7bbiehmtzcowfxfmmfdusotfc36
==> Updating view at /opt/environments/om2-version-access-om2/.spack-env/view

[dougiesquire]

@harshula, a random tip: if you put your diff codeblocks in

```diff

```

they get coloured nicely 😎

[harshula]

We may need to revert this back to latest.