[BRE-784] Fixing web vault build to pull valid server ref (#14382)

.github/workflows/build-web.yml

@@ -133,12 +133,34 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
+      - name: Get Latest Server Version
+        id: latest-server-version
+        uses: bitwarden/gh-actions/get-release-version@main
+        with:
+          repository: bitwarden/server
+          trim: false
+
+      - name: Set Server Ref
+        id: set-server-ref
+        run: |
+          SERVER_REF="${{ steps.latest-server-version.outputs.version }}"
+          echo "Latest server release version: $SERVER_REF"
+          if [[ "$GITHUB_REF" == "refs/heads/main" ]]; then
+            SERVER_REF="$GITHUB_REF"
+          elif [[ "$GITHUB_REF" == "refs/heads/rc" ]]; then
+            SERVER_REF="$GITHUB_REF"
+          elif [[ "$GITHUB_EVENT_NAME" == "pull_request" ]]; then
+            SERVER_REF="refs/heads/main"
+          fi
+          echo "Server ref: $SERVER_REF"
+          echo "server_ref=$SERVER_REF" >> $GITHUB_OUTPUT
+
       - name: Check out Server repo
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           path: server
           repository: bitwarden/server
-          ref: ${{ github.event.pull_request.head.sha && 'main' || github.ref }}
+          ref: ${{ steps.set-server-ref.outputs.server_ref }}
 
       - name: Check Branch to Publish
         env: