CI: v22.06 is EOL, drop v21.12 -> v22.06 check

.ci/generate_page.sh

@@ -6,7 +6,6 @@
 export CHANNELS="
 	v22.12-edge
 	v22.06-v22.12
-	v21.12-v22.06
 	"
 export DEVICES="
 	qemu-amd64

.gitlab-ci.yml

@@ -73,28 +73,6 @@ upgrade-compat-v22.06-v22.12:
     paths:
       - "*.check-passed"
 
-# upgrade compatibility v21.12 --> v22.06
-upgrade-compat-v21.12-v22.06:
-  parallel:
-    matrix:
-      - DEVICE: ['qemu-amd64']
-        UI: ['phosh', 'plasma-mobile', 'sxmo-de-dwm', 'sxmo-de-sway', 'console']
-        CHANNEL_OLD: ['v21.12']
-        CHANNEL_NEW: ['v22.06']
-  stage: compatibility
-  <<: *only-default
-  before_script:
-    - wget "https://gitlab.com/postmarketOS/ci-common/-/raw/master/install_pmbootstrap.sh"
-    - sh ./install_pmbootstrap.sh pytest
-  script:
-    - su pmos -c ".ci/upgrade-compat.sh"
-    - touch upgrade-compat-v21.12-v22.06-"$DEVICE"-"$UI".check-passed
-  allow_failure: true
-  artifacts:
-    when: always
-    paths:
-      - "*.check-passed"
-
 # badges
 pages:
   stage: badge

upgrade.sh

@@ -19,7 +19,6 @@ CHANNELS_ALL="
 # https://gitlab.com/postmarketOS/postmarketos-release-upgrade/
 UPGRADES_SUPPORTED="
 	v22.12-edge
-	v21.12-v22.06
 	v22.06-v22.12
 "