Add basic recipe for OpenFOAM-8 (just MC on Eiger) (#60)

adds a recipe for creating an image containing OpenFOAM Foundation v8 on Eiger, that:
- builds `openfoam-org@8`
- provides module `openfoam/8`
- provides two views, `openfoam` for the average user that just need the package, and `develop` for users that needs dependencies to build `openfoam-org` from scratch on their own

note: `openfoam-org@8` provided by the spack package is not the very last tagged version on the GitHub repo. I already played with it and I might have a solution to adapt this recipe to actually build a custom tag. But I will take care of it in a separate PR.

config.yaml

@@ -82,6 +82,13 @@ uenvs:
       deploy:
         eiger: [zen2]
       develop: False
+  # OpenFOAM Foundation
+  openfoam-org:
+    "8":
+      recipes:
+        zen2: 8/mc
+      deploy:
+        eiger: [zen2]
   prgenv-gnu:
     "23.11":
       recipes:

recipes/openfoam-org/8/mc/compilers.yaml

@@ -0,0 +1,5 @@
+bootstrap:
+  spec: gcc@12
+gcc:
+  specs:
+  - gcc@12

recipes/openfoam-org/8/mc/config.yaml

@@ -0,0 +1,7 @@
+name: openfoam
+description: OpenFOAM Foundation v8
+store: /user-environment
+spack:
+  repo: https://github.com/spack/spack.git
+  commit: releases/v0.21
+modules: true

recipes/openfoam-org/8/mc/environments.yaml

@@ -0,0 +1,13 @@
+openfoam-env:
+  compiler:
+  - toolchain: gcc
+    spec: gcc@12
+  mpi:
+    spec: cray-mpich
+  unify: true
+  specs:
+  - openfoam-org@8
+  views:
+    openfoam:
+    develop:
+      exclude: ['openfoam-org']

recipes/openfoam-org/8/mc/modules.yaml

@@ -0,0 +1,13 @@
+modules:
+  default:
+    arch_folder: false
+    roots:
+      tcl: /user-environment/modules
+    tcl:
+      all:
+        autoload: none
+      hash_length: 0
+      projections:
+        openfoam-org: "openfoam/{version}"
+      include: [openfoam-org]
+      exclude: ["%gcc@12", "%gcc@7"]