listmonk: fix frontend build due to OpenSSL 3.0 deprecations

* listmonk: fix frontend build using Webpack due to OpenSSL 3.0 deprecations

See the OpenSSL 3.0 section here https://medium.com/the-node-js-collection/node-js-17-is-here-8dba1e14e382 for explanations.
Adds the missing hooks (pre/postinstall).

* listmonk: fix runHook preInstall

* listmonk: fix runHook postInstall

Co-authored-by: superherointj <[e-mail]>

pkgs/servers/mail/listmonk/frontend.nix

···
   yarnLock = ./yarn.lock;
   yarnNix = ./yarn.nix;
 
+  # For Node.js v17+, this is necessary.
+  NODE_OPTIONS = "--openssl-legacy-provider";
+
   installPhase = ''
+    runHook preInstall
+
     cd deps/listmonk-frontend/frontend
     npm run build
 
     mv dist $out
+
+    runHook postInstall
   '';
 
   doDist = false;