Add VSCode tasks for bazel clean operations

Adds `bazel clean` and `bazel clean --expunge` tasks to tasks.json.

Fixes a typo for the fastbuild compilation mode task.

.vscode/tasks.json

@@ -59,7 +59,7 @@
       "label": "Bazel build workerd (fastbuild)",
       "type": "shell",
       "command": "bazel",
-      "args": ["build", "--config", "fastbuild", "//src/workerd/server:workerd"],
+      "args": ["build", "-c", "fastbuild", "//src/workerd/server:workerd"],
       "group": {
         "kind": "build",
         "isDefault": true
@@ -93,6 +93,42 @@
         "clear": true
       }
     },
+    {
+      "label": "Bazel clean",
+      "type": "shell",
+      "command": "bazel",
+      "args": ["clean"],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "presentation": {
+        "echo": true,
+        "reveal": "always",
+        "focus": false,
+        "panel": "shared",
+        "showReuseMessage": false,
+        "clear": true
+      }
+    },
+    {
+      "label": "Bazel clean --expunge",
+      "type": "shell",
+      "command": "bazel",
+      "args": ["clean", "--expunge"],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "presentation": {
+        "echo": true,
+        "reveal": "always",
+        "focus": false,
+        "panel": "shared",
+        "showReuseMessage": false,
+        "clear": true
+      }
+    },
     {
       "label": "Bazel run all tests",
       "type": "shell",

docs/vscode.md

@@ -29,6 +29,8 @@ The [.vscode/tasks.json](../.vscode/tasks.json) file provides a few useful tasks
 * Bazel build workerd (fastbuild)
 * Bazel build workerd (opt)
 * Bazel build all (dbg)
+* Bazel clean
+* Bazel clean --expunge
 * Bazel run all tests
 * Generate compile_commands.json
 * Generate rust-project.json