Remove Ubuntu Plucky (EOL)

Author: tianon

generate-stackbrew-library.sh

@@ -96,7 +96,7 @@ for version; do
 
 		# https://github.com/docker-library/official-images/pull/19581#issuecomment-3161255023 - Ubuntu 25.10+ ("questing") has updated their riscv64 baseline to RVA23 which is unsupported by DOI (and ... the entire public hardware ecosystem ATM)
 		case "$version" in
-			ubuntu/jammy | ubuntu/noble | ubuntu/plucky) ;; # pre-25.10 releases which can keep riscv64 support
+			ubuntu/jammy | ubuntu/noble) ;; # pre-25.10 releases which can keep riscv64 support
 			ubuntu/*) variantArches="$(sed <<<" $variantArches " -e 's/ riscv64 / /g')" ;;
 		esac
 

ubuntu/plucky/Dockerfile

@@ -55,14 +55,6 @@
       ""
     ]
   },
-  "ubuntu/plucky": {
-    "suite": "25.04",
-    "variants": [
-      "curl",
-      "scm",
-      ""
-    ]
-  },
   "ubuntu/questing": {
     "suite": "25.10",
     "variants": [