Don't use configurables for licenses (pixie-io#1458)

Summary: This ensures that all cloud builds have a working
credits page with a somewhat graceful though suboptimal
fallback.

Type of change: /kind cleanup

Test Plan: Check the credits page for an OSS cloud build.

---------

Signed-off-by: Vihang Mehta <vihang@pixielabs.ai>

bazel/ui.bzl

@@ -83,7 +83,7 @@ def _pl_webpack_library_impl(ctx):
     cmd = env_cmds + ui_shared_cmds_start + cp_cmds + [
         'pushd "$TMPPATH/src/ui" &> /dev/null',
         'tar -xzf "$BASE_PATH/{}"'.format(ctx.file.deps.path),
-        '[ ! -d src/configurables/private ] || mv "$BASE_PATH/{}" src/configurables/private/licenses.json'.format(ctx.file.licenses.path),
+        'mv -f "$BASE_PATH/{}" src/pages/credits/licenses.json'.format(ctx.file.licenses.path),
         "retval=0",
         "output=`yarn build_prod 2>&1` || retval=$?",
         '[ "$retval" -eq 0 ] || (echo $output; echo "Build Failed with Code: $retval"; exit $retval)',

src/ui/src/pages/credits/credits.tsx

@@ -25,7 +25,8 @@ import { createStyles, makeStyles } from '@mui/styles';
 import { buildClass, scrollbarStyles, Footer } from 'app/components';
 import { WithChildren } from 'app/utils/react-boilerplate';
 import { Copyright } from 'configurable/copyright';
-import licenseJson from 'configurable/licenses.json';
+
+import licenseJson from './licenses.json';
 
 const useStyles = makeStyles((theme: Theme) => createStyles({
   root: {

src/ui/src/pages/credits/licenses.json

@@ -0,0 +1,8 @@
+[
+  {
+    "name": "Pixie dependencies",
+    "url": "https://github.com/pixie-io/pixie",
+    "spdxID": "NOASSERTION",
+    "licenseText": "License file not written at build time.\nList of all licenses for the latest release are available at https://storage.googleapis.com/pixie-dev-public/oss-licenses/latest.json\n"
+  }
+]