AZP: Remove obsolete OSes from the build matrix

Author: Alexey-Rivkin

Diff for: buildlib/pr/main.yml

@@ -18,24 +18,12 @@ resources:
     - container: fedora
       image: rdmz-harbor.rdmz.labs.mlnx/ucx/fedora33:2
       options: $(DOCKER_OPT_ARGS)
-    - container: fedora34
-      image: rdmz-harbor.rdmz.labs.mlnx/ucx/fedora34:2
-      options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
     - container: coverity_rh7
       image: rdmz-harbor.rdmz.labs.mlnx/ucx/coverity:mofed-5.1-2.3.8.0
       options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
-    - container: rhel76
-      image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/rhel7.6/builder:mofed-5.0-1.0.0.0
-      options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
     - container: rhel76_mofed47
       image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/rhel7.6/builder:mofed-4.7-1.0.0.1
       options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
-    - container: rhel74
-      image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/rhel7.4/builder:mofed-5.0-1.0.0.0
-      options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
-    - container: rhel72
-      image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/rhel7.2/builder:mofed-5.0-1.0.0.0
-      options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
     - container: rhel82
       image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/rhel8.2/builder:mofed-5.0-1.0.0.0
       options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
@@ -66,9 +54,6 @@ resources:
     - container: sles15sp2
       image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/sles15sp2/builder:mofed-5.0-1.0.0.0
       options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
-    - container: sles12sp5
-      image: rdmz-harbor.rdmz.labs.mlnx/ucx/x86_64/sles12sp5/builder:mofed-5.0-1.0.0.0
-      options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_VOLUMES)
     - container: centos7_cuda_11_0
       image: nvidia/cuda:11.0.3-devel-centos7
       options: $(DOCKER_OPT_ARGS) $(DOCKER_OPT_GPU)
@@ -201,13 +186,6 @@ stages:
             - ucx_docker -equals yes
         strategy:
           matrix:
-            rhel72:
-              CONTAINER: rhel72
-            rhel74:
-              CONTAINER: rhel74
-            rhel76:
-              CONTAINER: rhel76
-              long_test: yes
             rhel76_mofed47:
               CONTAINER: rhel76_mofed47
               long_test: yes
@@ -232,9 +210,6 @@ stages:
               CONTAINER: rhel82
             rhel90:
               CONTAINER: rhel90
-            fedora34:
-              CONTAINER: fedora34
-              long_test: yes
             centos7:
               CONTAINER: centos7_ib
             ubuntu2004_rocm: