adds render.com support

Dockerfile.render

@@ -0,0 +1 @@
+FROM calcom.docker.scarf.sh/calcom/cal.com

render.yaml

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+services:
+  - type: web
+    name: cal-web
+    plan: standard
+    repo: https://github.com/calcom/docker.git
+    dockerfilePath: ./Dockerfile.render
+    env: docker
+    envVars:
+
+      - key: DATABASE_URL
+        fromDatabase:
+          name: cal-postgres
+          property: connectionString
+
+      - key: NEXT_PUBLIC_WEBAPP_URL
+        value: https://cal-web.onrender.com
+
+      - key: CALENDSO_ENCRYPTION_KEY
+        value: secret
+
+      - key: NEXTAUTH_URL
+        value: https://cal-web.onrender.com
+
+      - key: NEXTAUTH_SECRET
+        value: secret
+
+      - key: CRON_API_KEY
+        value: 0cc0e6c35519bba620c9360cfe3e68d0
+
+databases:
+  - name: cal-postgres
+    plan: starter