Read raw file contents directly instead of using REST API

REST API endpoint returns base64 encoded data which then needs to be decoded.
Can simply read the Raw file contents from the publicly available file.

.github/workflows/image_build_push.yml

@@ -20,15 +20,8 @@ jobs:
     - name: Fetch server image tag
       id: get-server-tag
       run: |
-        response=$(curl -s \
-          -H "Authorization: Bearer ${{ secrets.GH_FG_PAT_TAGS }}" \
-          -H "Accept: application/vnd.github+json" \
-          -H "X-GitHub-Api-Version: 2022-11-28" \
-          https://api.github.com/repos/MukuFlash03/e-mission-server/contents/.env?ref=cleanup-cicd)
-        
-        content=$(echo "$response" | jq -r .content)
-        decoded_content=$(echo "$content" | base64 --decode)
-        SERVER_IMAGE_TAG=$(echo "$decoded_content" | grep "SERVER_IMAGE_TAG=" | cut -d'=' -f2)
+        response=$(curl -s https://raw.githubusercontent.com/MukuFlash03/e-mission-server/refs/heads/cleanup-cicd/.env)
+        SERVER_IMAGE_TAG=$(echo "$response" | grep "SERVER_IMAGE_TAG=" | cut -d'=' -f2)
         echo "SERVER_IMAGE_TAG=$SERVER_IMAGE_TAG" >> "$GITHUB_OUTPUT"
 
     - name: Set docker image tags