Swift: moved install to a separate package

When importing the workspace from semmle-code, we do not need nor want
to instantiate `@util`, so that must be in a separate bazel package.

WORKSPACE.bazel

@@ -27,19 +27,6 @@ http_archive(
     ],
 )
 
-http_archive(
-    name = "bazel_skylib",
-    sha256 = "c6966ec828da198c5d9adbaa94c05e3a1c7f21bd012a0b29ba8ddbccb2c93b0d",
-    urls = [
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.1.1/bazel-skylib-1.1.1.tar.gz",
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.1.1/bazel-skylib-1.1.1.tar.gz",
-    ],
-)
-
-load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
-
-bazel_skylib_workspace()
-
 load("@ql//:defs.bzl", "ql_utils")
 
 ql_utils(name = "utils")

swift/BUILD.bazel

@@ -1,8 +1,5 @@
 load("@rules_pkg//:mappings.bzl", "pkg_attributes", "pkg_filegroup", "pkg_files")
-load("@rules_pkg//:install.bzl", "pkg_install")
 load("@ql//:defs.bzl", "codeql_platform")
-load("@bazel_skylib//rules:native_binary.bzl", "native_binary")
-load("@utils//:paths.bzl", "source_dir")
 
 pkg_files(
     name = "dbscheme",
@@ -55,12 +52,3 @@ pkg_filegroup(
     ],
     visibility = ["//visibility:public"],
 )
-
-pkg_install(
-    name = "install",
-    srcs = [":extractor-pack"],
-    args = [
-        "--destdir",
-        source_dir() + "/extractor_pack",
-    ],
-)

swift/README.md

@@ -4,5 +4,5 @@ The Swift codeql package is an experimental and unsupported work in progress.
 
 ## Usage
 
-Run `bazel run //swift:install-extractor`, which will install `swift/extractor_pack`. Using `--search-path=swift` will
+Run `bazel run //swift/install`, which will install `swift/extractor_pack`. Using `--search-path=swift` will then pick
-then pick up the Swift extractor.
+up the Swift extractor.

swift/install/BUILD.bazel

@@ -0,0 +1,11 @@
+load("@utils//:paths.bzl", "source_dir")
+load("@rules_pkg//:install.bzl", "pkg_install")
+
+pkg_install(
+    name = "install",
+    srcs = ["//swift:extractor-pack"],
+    args = [
+        "--destdir",
+        source_dir() + "/../extractor_pack",
+    ],
+)