Add multi-platform support to build script by creating a dedicated buildx builder

Author: amkisko

build.sh

@@ -1,3 +1,15 @@
 #!/bin/bash
 
+# Create and use a buildx builder that supports multi-platform builds
+BUILDER_NAME="multiarch"
+
+# Remove old builder if it exists (e.g., from previous Docker context like Rancher Desktop)
+if docker buildx ls | grep -q "$BUILDER_NAME"; then
+    docker buildx rm "$BUILDER_NAME" 2>/dev/null || true
+fi
+
+# Create new builder with current Docker context (Colima)
+docker buildx create --name "$BUILDER_NAME" --driver docker-container --use
+docker buildx inspect --bootstrap
+
 docker buildx build . --tag kiskolabs/postgres-fi:latest --platform linux/amd64,linux/arm64 --push