Fixed a major issue in building docker image for backend where the env file was not being copied which resulted in backend not working!

Backend/.env

@@ -0,0 +1,25 @@
+PORT = 8000
+FRONTEND_URI = ${FRONTEND_URI}
+
+# Database
+MONGODB_URI = ${MONGODB_URI}
+DATABASE_NAME=CropCompass
+
+# Mail server
+SMPT_SERVICE = ${SMTP_SERVICE}
+SMPT_MAIL = ${SMTP_EMAILADDR}
+SMPT_PASSWORD = ${SMTP_PASSWORD}
+HOST = ${SMTP_HOST}
+EMAIL_PORT = ${SMTP_PORT}
+
+# Cloudinary
+CLOUDINARY_CLOUD_NAME = ${CLOUDINARY_CLOUD_NAME}
+CLOUDINARY_API_KEY = ${CLOUDINARY_API_KEY}
+CLOUDINARY_API_SECRET = ${CLOUDINARY_API_SECRET}
+
+# Gemini
+GEMINI_API_KEY = ${GEMINI_API_KEY}
+
+# Refresh token
+TOKEN_NAME  = uid
+REFRESH_TOKEN_EXPIRY = 10d