Add docker-entrypoint.sh for command configuration

Author: FelixClements

docker-entrypoint.sh

@@ -0,0 +1,47 @@
+#!/bin/sh
+set -e
+
+# Start with the command "serve"
+COMMAND="serve"
+
+# 1. Handle Port
+# If PORT env var is set, append --port <val>
+if [ -n "$PORT" ]; then
+    COMMAND="$COMMAND --port $PORT"
+fi
+
+# 2. Handle Hostname
+# Default to 0.0.0.0 in Docker so it is accessible outside the container,
+# unless explicitly overridden.
+if [ -n "$HOSTNAME_OVERRIDE" ]; then
+    COMMAND="$COMMAND --hostname $HOSTNAME_OVERRIDE"
+else
+    COMMAND="$COMMAND --hostname 0.0.0.0"
+fi
+
+# 3. Handle mDNS
+# If MDNS=true, add the flag
+if [ "$MDNS" = "true" ]; then
+    COMMAND="$COMMAND --mdns"
+fi
+
+# 4. Handle mDNS Domain
+if [ -n "$MDNS_DOMAIN" ]; then
+    COMMAND="$COMMAND --mdns-domain $MDNS_DOMAIN"
+fi
+
+# 5. Handle CORS
+# Docker users often set CORS as a comma-separated string (e.g., "http://a,http://b")
+# We split that string into multiple --cors flags.
+if [ -n "$CORS" ]; then
+    # Split string by comma
+    IFS=',' read -ra ORIGINS <<< "$CORS"
+    for origin in "${ORIGINS[@]}"; do
+        # Trim whitespace and append flag
+        COMMAND="$COMMAND --cors $(echo $origin | xargs)"
+    done
+fi
+
+# Execute the opencode command with constructed arguments
+# Pass all other arguments ($@) as well to allow manual overrides
+exec opencode $COMMAND "$@"