build: add installation of LLVM 18

Using 15 causes a segmentation fault on `aarch64`.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

tasks/build.yml

@@ -1,4 +1,11 @@
 ---
+- name: Install Clang compiler
+  homebrew:
+    name: 'llvm@18'
+    state: 'linked'
+    upgrade: false
+  become_user: 'admin'
+
 - name: Clone repo
   git:
     repo: '{{ beacon_node_repo_url }}'

templates/scripts/build.sh.j2

@@ -51,8 +51,8 @@ if [[ "${USER}" != "{{ beacon_node_user }}" ]]; then
     exit 1
 fi
 
-# Source profile to set correct PATH (to find homebrew binaries such as cmake)
-source /etc/profile
+# Set correct PATH to find Homebrew binaries such as cmake.
+eval "$({{ homebrew_path }}/bin/brew shellenv)"
 
 # Build the Beacon node binaries
 pushd repo >/dev/null