Add Alma Linux leg to source build CI (#19995)

Author: MichaelSimons

eng/pipelines/templates/stages/vmr-build.yml

@@ -91,6 +91,23 @@ stages:
 
     # CI - Stage 1 x64 legs ------------------------------------
 
+    # This AlmaLinux leg is intended to build with the min supported glibc version
+    - template: ../jobs/vmr-build.yml
+      parameters:
+        # Changing the build name requires updating the referenced name in the source-build-sdk-diff-tests.yml pipeline
+        buildName: ${{ format('{0}_Offline_MsftSdk', variables.almaLinuxName) }}
+        isBuiltFromVmr: ${{ parameters.isBuiltFromVmr }}
+        vmrBranch: ${{ variables.VmrBranch }}
+        architecture: x64
+        pool: ${{ parameters.pool_Linux }}
+        container: ${{ variables.almaLinuxContainer }}
+        buildFromArchive: false            # 🚫
+        enablePoison: false                # 🚫
+        excludeOmniSharpTests: true        # ✅
+        runOnline: false                   # 🚫
+        useMonoRuntime: false              # 🚫
+        withPreviousSDK: false             # 🚫
+
     - template: ../jobs/vmr-build.yml@self
       parameters:
         # Changing the build name requires updating the referenced name in the source-build-sdk-diff-tests.yml pipeline

eng/pipelines/templates/variables/vmr-build.yml

@@ -1,4 +1,6 @@
 variables:
+- name: almaLinuxContainer
+  value: mcr.microsoft.com/dotnet-buildtools/prereqs:almalinux-8-source-build
 - name: alpineContainer
   value: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.19-WithNode
 - name: centOSStreamContainer
@@ -10,6 +12,8 @@ variables:
 - name: ubuntuArmContainer
   value: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-arm64
 
+- name: almaLinuxName
+  value: AlmaLinux8
 - name: alpineName
   value: Alpine319
 - name: centOSStreamName
@@ -19,6 +23,8 @@ variables:
 - name: ubuntuName
   value: Ubuntu2204
 
+- name: almaLinuxX64Rid
+  value: almalinux.8-x64
 - name: alpineX64Rid
   value: alpine.3.19-x64
 - name: centOSStreamX64Rid

src/SourceBuild/content/eng/pipelines/source-build-sdk-diff-tests.yml

@@ -45,6 +45,13 @@ jobs:
     dotnetDotnetRunId: ${{ parameters.dotnetDotnetRunId }}
     publishTestResultsPr: true
 
+- template: templates/jobs/sdk-diff-tests.yml
+  parameters:
+    buildName: ${{ format('{0}_Offline_MsftSdk', variables.almaLinuxName) }}
+    targetRid: ${{ variables.almaLinuxX64Rid }}
+    architecture: x64
+    dotnetDotnetRunId: ${{ parameters.dotnetDotnetRunId }}
+
 - template: templates/jobs/sdk-diff-tests.yml
   parameters:
     buildName: ${{ format('{0}_Offline_MsftSdk', variables.alpineName) }}