chore: Update alpha-build.sh script to handle xvfb-run not found and enable LTO only when not cross-compiling

.github/workflows/src/alpha-build.sh

@@ -3,8 +3,9 @@ export ZEN_RELEASE=1
 # Check if xfvb is installed
 if ! command -v xvfb-run &> /dev/null
 then
-    echo "xvfb-run could not be found, running without it"
-    pnpm build
+  echo "xvfb-run could not be found, running without it"
+  pnpm build
 else
+  export DISPLAY=:2
   xvfb-run -s "-screen 0 1920x1080x24 -nolisten local" pnpm build
 fi

configs/common/mozconfig

@@ -61,9 +61,11 @@ if test "$ZEN_RELEASE"; then
   ac_add_options --disable-profiling
   ac_add_options --disable-rust-tests
 
-  export MOZ_LTO=full
-  ac_add_options MOZ_LTO=full
-  ac_add_options --enable-lto=full
+  if ! test "$ZEN_CROSS_COMPILING"; then
+    export MOZ_LTO=full
+    ac_add_options MOZ_LTO=full
+    ac_add_options --enable-lto=full
+  fi
 
   mk_add_options MOZILLA_OFFICIAL=1
 
@@ -77,9 +79,6 @@ if test "$ZEN_RELEASE"; then
   ac_add_options OPT_LEVEL="3"
   export RUSTC_OPT_LEVEL="3"
   ac_add_options RUSTC_OPT_LEVEL="3"
-
-  export MOZ_PGO=1
-  ac_add_options MOZ_PGO=1
 fi
 
 ac_add_options --enable-unverified-updates

configs/linux/mozconfig

@@ -19,6 +19,11 @@ if ! test "$ZEN_CROSS_COMPILING"; then
     export STRIP_FLAGS="--strip-debug --strip-unneeded"
 fi
 
+if test "$ZEN_RELEASE"; then
+    export MOZ_PGO=1
+    ac_add_options MOZ_PGO=1
+fi
+
 # Disable telemetry and tracking
 mk_add_options MOZ_TELEMETRY_REPORTING=
 mk_add_options MOZ_DATA_REPORTING=