add aarch64-linux to ext tests as it should be supported by test vm and update http tests

Author: encima

nix/checks.nix

@@ -354,7 +354,7 @@
             postgresql_17_src
             ;
         }
-        // pkgs.lib.optionalAttrs (system == "x86_64-linux") (
+        // pkgs.lib.optionalAttrs (system == "x86_64-linux" || system == "aarch64-linux") (
           {
             devShell = self'.devShells.default;
           }

nix/ext/tests/http.nix

@@ -103,11 +103,13 @@ self.inputs.nixpkgs.lib.nixos.runTest {
     { nodes, ... }:
     let
       pg17-configuration = "${nodes.server.system.build.toplevel}/specialisation/postgresql17";
+      # Convert versions to major.minor format (e.g., "1.5.0" -> "1.5")
+      toMajorMinor = map (v: lib.versions.majorMinor v);
     in
     ''
       versions = {
-        "15": [${lib.concatStringsSep ", " (map (s: ''"${s}"'') (versions "15"))}],
-        "17": [${lib.concatStringsSep ", " (map (s: ''"${s}"'') (versions "17"))}],
+        "15": [${lib.concatStringsSep ", " (map (s: ''"${s}"'') (toMajorMinor (versions "15")))}],
+        "17": [${lib.concatStringsSep ", " (map (s: ''"${s}"'') (toMajorMinor (versions "17")))}],
       }
 
       def run_sql(query):