ci: Disable always failing checks

centos 7 and ubuntu 20.x are failing always.
Until we fix the CI images, let's disable this.

Author: ChristianTackeGSI

Jenkinsfile

@@ -105,16 +105,16 @@ pipeline{
       steps{
         script {
           def builds = jobMatrix('alfa-ci', 'build', [
-            [os: 'centos',     ver: '7',     arch: 'x86_64', compiler: 'gcc-7',           fairsoft: 'apr21_patches'],
-            [os: 'centos',     ver: '7',     arch: 'x86_64', compiler: 'gcc-7',           fairsoft: 'apr21_patches_mt'],
+            // [os: 'centos',     ver: '7',     arch: 'x86_64', compiler: 'gcc-7',           fairsoft: 'apr21_patches'],
+            // [os: 'centos',     ver: '7',     arch: 'x86_64', compiler: 'gcc-7',           fairsoft: 'apr21_patches_mt'],
             [os: 'debian',     ver: '10',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr21_patches'],
             [os: 'debian',     ver: '10',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr21_patches_mt'],
             [os: 'debian',     ver: '11',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr21_patches'],
             [os: 'debian',     ver: '11',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr21_patches_mt'],
             [os: 'debian',     ver: '11',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr22_patches'],
             [os: 'debian',     ver: '11',    arch: 'x86_64', compiler: 'gcc-8',           fairsoft: 'apr22_patches_mt'],
-            [os: 'ubuntu',     ver: '20.04', arch: 'x86_64', compiler: 'gcc-9',           fairsoft: 'apr21_patches'],
-            [os: 'ubuntu',     ver: '20.04', arch: 'x86_64', compiler: 'gcc-9',           fairsoft: 'apr21_patches_mt'],
+            // [os: 'ubuntu',     ver: '20.04', arch: 'x86_64', compiler: 'gcc-9',           fairsoft: 'apr21_patches'],
+            // [os: 'ubuntu',     ver: '20.04', arch: 'x86_64', compiler: 'gcc-9',           fairsoft: 'apr21_patches_mt'],
             [os: 'ubuntu',   ver: 'rolling', arch: 'x86_64', compiler: 'current',         fairsoft: 'dev',
                              check: 'warnings',
                              extra: '-DUSE_CLANG_TIDY=ON -DBUILD_MBS=OFF -DBUILD_PROOF_SUPPORT=OFF'],