Support both build-time and run-time values for WEBAPP_URL. Improve re-build time, if just the WEBAPP_URL is changed.

scripts/replace-placeholder.sh

@@ -0,0 +1,16 @@
+FROM=$1
+TO=$2
+
+if [ "${FROM}" = "${TO}" ]; then
+    echo "Nothing to replace, the value is already set to ${TO}."
+
+    exit 0
+fi
+
+# Only peform action if $FROM and $TO are different.
+echo "Replacing all statically built instances of $FROM with $TO."
+
+find apps/web/.next/ apps/web/public -type f |
+while read file; do
+    sed -i "s|$FROM|$TO|g" "$file"
+done

scripts/replace-placeholders.sh

@@ -1,5 +0,0 @@
-# Find and replace placeholder values with runtime-specific environment values
-find apps/web/.next/ apps/web/public -type f |
-while read file; do
-    sed -i "s|https://NEXT_PUBLIC_WEBAPP_URL_PLACEHOLDER|$NEXT_PUBLIC_WEBAPP_URL|g" "$file"
-done

scripts/start.sh

@@ -1,7 +1,10 @@
 #!/bin/sh
 set -x
 
-scripts/replace-placeholders.sh
+# Replace the statically built BUILT_NEXT_PUBLIC_WEBAPP_URL with run-time NEXT_PUBLIC_WEBAPP_URL
+# NOTE: if these values are the same, this will be skipped.
+scripts/replace-placeholder.sh "$BUILT_NEXT_PUBLIC_WEBAPP_URL" "$NEXT_PUBLIC_WEBAPP_URL"
+
 scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "database is up"
 npx prisma migrate deploy --schema /calcom/packages/prisma/schema.prisma
 npx ts-node --transpile-only /calcom/packages/prisma/seed-app-store.ts