Update Linux and Windows build workflows to use architecture-specific…

… runners and add dynamic port allocation in profileserver.py

.github/workflows/linux-release-build.yml

@@ -16,7 +16,7 @@ jobs:
   build-linux:
     permissions:
       contents: write
-    runs-on: ${{ inputs.release-branch == 'release' && 'warp-ubuntu-latest-x64-8x' || 'ubuntu-latest' }}
+    runs-on: ${{ matrix.arch == 'x86_64' && 'warp-ubuntu-latest-x64-8x' || 'ubuntu-latest' }}
     strategy:
       fail-fast: false
       matrix:

.github/workflows/windows-release-build.yml

@@ -22,7 +22,7 @@ on:
 jobs:
   windows-build:
     name: Build Windows - ${{ matrix.arch }}
-    runs-on: ${{ (inputs.release-branch == 'release' && !(inputs.generate-gpo && matrix.arch == 'aarch64')) && 'warp-ubuntu-latest-x64-8x' || 'ubuntu-latest' }}
+    runs-on: ${{ (inputs.release-branch == 'release' && !(inputs.generate-gpo && matrix.arch == 'aarch64')) && 'warp-ubuntu-latest-x64-6x' || 'ubuntu-latest' }}
 
     strategy:
       fail-fast: false

src/build/pgo/profileserver-py.patch

@@ -0,0 +1,19 @@
+diff --git a/build/pgo/profileserver.py b/build/pgo/profileserver.py
+index 31556cc9ae1a44a04e300083f7be4dc908cc3794..23ef1d8f5b30068ffdddc3c9cb6cd45e64d93071 100755
+--- a/build/pgo/profileserver.py
++++ b/build/pgo/profileserver.py
+@@ -18,7 +18,13 @@ from mozprofile import FirefoxProfile, Preferences
+ from mozprofile.permissions import ServerLocations
+ from mozrunner import CLI, FirefoxRunner
+
+-PORT = 8888
++import socket
++def find_free_port():
++    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
++        s.bind(('', 0))
++        return s.getsockname()[1]
++
++PORT = find_free_port()
+
+ PATH_MAPPINGS = {
+     "/webkit/PerformanceTests": "third_party/webkit/PerformanceTests",