Implement --last-known-good-version for the install sub command

src/c4t/__init__.py

@@ -459,4 +459,16 @@ def last_known_good_versions(self) -> List[str]:
                 installed = ''
             print(f'{n} - {channel} version={version}, revision={revision}{installed}')
             versions.append(version)
-        return versions
+        return versions
+
+    def install_last_known_good_version(self) -> None:
+        versions = self.last_known_good_versions()
+        try:
+            selection = int(input('Select a version by number: '))
+        except ValueError:
+            selection = None
+        except IndexError:
+            selection = None
+
+        if selection is not None:
+            self.install(version=versions[selection])

src/c4t/cli.py

@@ -36,6 +36,12 @@ def cli() -> None:
         help="The version of 'Chrome for Testing' assets to install. " +
              "The default is '%(default)s'"
     )
+    sp_install.add_argument(
+        '-l',
+        '--last-known-good-version',
+        action='store_true',
+        help='Install a last known good version from a list'
+    )
 
     help_path = 'Show the installation path of assets and exit.'
     sub_parsers.add_parser(
@@ -80,8 +86,11 @@ def cli() -> None:
     args = parser.parse_args()
 
     if args.command == 'install':
-        print(f"Installing version '{args.version}'")
-        assets.install(version=args.version)
+        if args.last_known_good_version:
+            assets.install_last_known_good_version()
+        else:
+            print(f"Installing version '{args.version}'")
+            assets.install(version=args.version)
 
     if args.command == 'path':
         print(f'Path to assets: {assets.path}')