ci: use run-tests.sh

ci/build.nix

@@ -1,12 +0,0 @@
-let
-  pkgs = import <nixpkgs> {};
-  nbPkgs = import ../pkgs { inherit pkgs; };
-  ciPkgs = with nbPkgs; [
-    electrs
-    elementsd
-    hwi
-    joinmarket
-    lightning-loop
-  ];
-in
-pkgs.writeText "ci-pkgs" (pkgs.lib.concatMapStringsSep "\n" toString ciPkgs)

ci/build.sh

@@ -21,9 +21,9 @@ fi
 echo "$NIX_PATH ($(nix eval --raw nixpkgs.lib.version))"
 
 if [[ $scenario ]]; then
-    buildExpr=$(../test/run-tests.sh --scenario $scenario exprForCI)
+    testArgs="--scenario $scenario"
 else
-    buildExpr="import ./build.nix"
+    testArgs=pkgsUnstable
 fi
 
-"${BASH_SOURCE[0]%/*}/build-to-cachix.sh" -E "$buildExpr"
+"${BASH_SOURCE[0]%/*}/../test/run-tests.sh" --ci $testArgs