Bazel: reorganization

* fixed 5.0.0 as bazel version
* made dependencies better loadable
* moved `//swift/install` to `//swift:create-extractor-pack` (following
  the clearer ruby naming)
* renamed `extractor_pack` to `extractor-pack` for consistency with Ruby

swift/.codeqlmanifest.json

@@ -2,6 +2,6 @@
   "provide": [
     "ql/lib/qlpack.yml",
     "ql/test/qlpack.yml",
-    "extractor_pack/codeql-extractor.yml"
+    "extractor-pack/codeql-extractor.yml"
   ]
 }

swift/.gitignore

@@ -1 +1 @@
-extractor_pack
+extractor-pack

swift/BUILD.bazel

@@ -1,5 +1,7 @@
 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("@ql_utils//:source_dir.bzl", "current_source_dir")
 
 pkg_files(
     name = "dbscheme",
@@ -52,3 +54,12 @@ pkg_filegroup(
     ],
     visibility = ["//visibility:public"],
 )
+
+pkg_install(
+    name = "create-extractor-pack",
+    srcs = ["//swift:extractor-pack"],
+    args = [
+        "--destdir",
+        current_source_dir() + "/extractor-pack",
+    ],
+)

swift/README.md

@@ -4,5 +4,6 @@ The Swift codeql package is an experimental and unsupported work in progress.
 
 ## Usage
 
-Run `bazel run //swift/install`, which will install `swift/extractor_pack`. Using `--search-path=swift` will then pick
-up the Swift extractor.
+Run `bazel run //swift:create-extractor-pack`, which will install `swift/extractor-pack`.
+Using `--search-path=swift/extractor-pack` will then pick up the Swift extractor. You can also use
+`--search-path=swift`, as the extractor pack is mentioned in `swift/.codeqlmanifest`.

swift/install/BUILD.bazel

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