remove ubuntu20

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

scripts/release.yml

@@ -85,34 +85,6 @@ stages:
         artifactName: 'UbuntuBuild'
         targetPath: $(Build.ArtifactStagingDirectory)
 
-  - job: UbuntuBuild20
-    displayName: "Ubuntu build 20"
-    pool:
-      vmImage: "ubuntu-20.04"
-    steps:
-    - task: PythonScript@0
-      displayName: Build
-      inputs:
-        scriptSource: 'filepath'
-        scriptPath: scripts/mk_unix_dist.py
-        arguments: --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk
-    - script: git clone https://github.com/z3prover/z3test z3test
-      displayName: 'Clone z3test'
-    - task: PythonScript@0
-      displayName: Test
-      inputs:
-        scriptSource: 'filepath'
-        scriptPath: z3test/scripts/test_benchmarks.py
-        arguments: build-dist/z3 z3test/regressions/smt2
-    - task: CopyFiles@2
-      inputs:
-        sourceFolder: dist
-        contents: '*.zip'
-        targetFolder: $(Build.ArtifactStagingDirectory)
-    - task: PublishPipelineArtifact@0
-      inputs:
-        artifactName: 'UbuntuBuild20'
-        targetPath: $(Build.ArtifactStagingDirectory)
 
   - job: UbuntuArm64
     displayName: "Ubuntu ARM64 build"
@@ -283,11 +255,6 @@ stages:
       inputs:
         artifact: 'UbuntuBuild'
         path: $(Agent.TempDirectory)\package
-    - task: DownloadPipelineArtifact@2
-      displayName: 'Download Ubuntu20 Build'
-      inputs:
-        artifact: 'UbuntuBuild20'
-        path: $(Agent.TempDirectory)\package
     - task: DownloadPipelineArtifact@2
       displayName: 'Download Ubuntu ARM64 Build'
       inputs:
@@ -545,11 +512,6 @@ stages:
     pool:
       vmImage: "windows-latest"
     steps:
-    - task: DownloadPipelineArtifact@2
-      displayName: 'Download Ubuntu Build'
-      inputs:
-        artifact: 'UbuntuBuild20'
-        path: $(Agent.TempDirectory)
     - task: DownloadPipelineArtifact@2
       displayName: 'Download Ubuntu Build'
       inputs: