nix: re-add step to call bundler install

Was removed in:
https://github.com/status-im/status-jenkins-lib/pull/48

But only causes issues when version of Ruby Gems change.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

nix/mobile/ios/default.nix

@@ -4,8 +4,10 @@
 let
   inherit (lib) catAttrs unique;
 
+  # Sub-shells preparing various dependencies.
   nodejs-sh = callPackage ./shells/nodejs.nix { };
-  cocoapods-sh = callPackage ./shells/pod.nix { };
+  bundler-sh = callPackage ./shells/bundler.nix { };
+  cocoapods-sh = callPackage ./shells/cocoapods.nix { };
   status-go-sh = callPackage ./shells/status-go.nix { inherit status-go; };
 
 in {
@@ -13,7 +15,7 @@ in {
 
   shell = mkShell {
     buildInputs = with pkgs; [
-      xcodeWrapper watchman bundler procps
+      xcodeWrapper watchman procps
       flock # used in nix/scripts/node_modules.sh
     ];
 
@@ -21,7 +23,8 @@ in {
     inputsFrom = [
       fastlane.shell
       cocoapods-sh
-      nodejs-sh # before 'pod install'
+      nodejs-sh    # before 'pod install'
+      bundler-sh   # before 'pod install'
       status-go-sh # before 'pod install'
     ];
   };

nix/mobile/ios/shells/bundler.nix

@@ -0,0 +1,8 @@
+{ mkShell, bundler }:
+
+mkShell {
+  buildInputs = [ bundler ];
+  shellHook = ''
+    bundle install --quiet --gemfile=fastlane/Gemfile
+  '';
+}

nix/mobile/ios/shells/pod.nix

@@ -1,24 +0,0 @@
-{ mkShell, cocoapods }:
-
-let
-  # source of what pod should install
-  podfileLock = "ios/Podfile.lock";
-  # current state of pods installed by pod
-  manifestLock = "ios/Pods/Manifest.lock";
-in mkShell {
-  buildInputs = [ cocoapods ];
-  shellHook = ''
-    pushd "$STATUS_MOBILE_HOME" > /dev/null
-    {
-      echo "Checking for modifications in ios/Pods..."
-      if diff -q ${podfileLock} ${manifestLock}; then
-        echo "No modifications detected."
-      else
-        # CocoaPods are trash and can't handle other pod instances running
-        ./scripts/wait-for.sh 240 'pod install'
-        (cd ios && pod install)
-      fi
-    }
-    popd > /dev/null
-  '';
-}