Allow sgx and virtual builds to be installed side-by-side using Ansible. (#4693)

getting_started/setup_vm/app-dev.yml

@@ -14,14 +14,21 @@
     - import_role:
         name: az_dcap
         tasks_from: install.yml
+
+    # If OE is already installed, we don't want to install hostverify as they are mutually
+    # exclusive. Non-SGX CCF builds can use either of them.
+    - name: Gather the package facts
+      ansible.builtin.package_facts:
+        manager: auto
     - import_role:
         name: openenclave
         tasks_from: binary_install.yml
-      when: platform == "sgx"
+      when: (platform == "sgx") or ("open-enclave" in ansible_facts.packages)
     - import_role:
         name: openenclave
         tasks_from: install_host_verify.yml
-      when: platform != "sgx"
+      when: (platform != "sgx") and ("open-enclave" not in ansible_facts.packages)
+
     - import_role:
         name: ccf_build
         tasks_from: install.yml

getting_started/setup_vm/roles/openenclave/tasks/binary_install.yml

@@ -1,6 +1,12 @@
 - name: Include vars
   include_vars: common.yml
 
+- name: Uninstall Open Enclave Host Verify
+  apt:
+    name: open-enclave-hostverify
+    state: absent
+  become: yes
+
 - name: Install Open Enclave
   apt:
     deb: "{{ oe_deb }}"