fix: Update to MorphoCloud/MorphoCloudWorkflow@7e99a45

List of MorphoCloudWorkflow changes:

```
$ git shortlog 76aad0e..7e99a45 --no-merges
Jean-Christophe Fillion-Robin (2):
      fix(create-instance): Ensure R library folder is created
      fix(cloud-config): Update to MorphoCloud/exosphere@5c85c9170
```

See MorphoCloud/MorphoCloudWorkflow@76aad0e...7e99a45

.github/workflows/create-instance.yml

@@ -501,7 +501,7 @@ jobs:
             -o UserKnownHostsFile=/dev/null \
             -o LogLevel=ERROR \
             exouser@$INSTANCE_IP \
-            'echo -e "R_LIBS_SITE=/media/share/MorphoCloudCephShare/R/x86_64-pc-linux-gnu-library/4.4/\nR_LIBS_USER=/media/volume/MyData/R/x86_64-pc-linux-gnu-library/4.4/" > /home/exouser/.Renviron'
+            'echo -e "R_LIBS_SITE=/media/share/MorphoCloudCephShare/R/x86_64-pc-linux-gnu-library/4.4/\nR_LIBS_USER=/media/volume/MyData/R/x86_64-pc-linux-gnu-library/4.4/" > /home/exouser/.Renviron && mkdir -p /media/volume/MyData/R/x86_64-pc-linux-gnu-library/4.4/'
         env:
           INSTANCE_IP: ${{ steps.ip_create.outputs.floating_ip_address }}
 

cloud-config

@@ -36,7 +36,7 @@ runcmd:
     # --checkout "{instance-config-mgt-repo-checkout}"
     # -e "{ansible-extra-vars}"
     rm -rf /opt/instance-config-mgt
-    exosphere_sha="5faa1fbef47fc4fb588b44fa0b577d7d72b64db5" # morpho-cloud-portal-2024.07.17-78a7e2d93
+    exosphere_sha="5c85c9170fbb8ddee99d4c81811ce3468b0279a8" # morpho-cloud-portal-2024.07.17-78a7e2d93
     ansible-pull \
       --url "https://github.com/MorphoCloud/exosphere.git" \
       --checkout "$exosphere_sha" \