add a docker file and generate certs and more makefile notes

MAKEFILENOTES.md

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+To use the Makefile, simply run `make` followed by the target name:
+
+```bash
+# View all available commands
+make help
+
+# Common commands:
+
+# Download Go dependencies
+make deps
+
+# Build the Go binary
+make build
+
+# Build Docker image
+make docker-build
+
+# Build and push Docker image
+make docker-build docker-push
+
+# Generate TLS certificates
+make certs
+
+# Deploy to Kubernetes
+make deploy
+
+# View webhook logs
+make logs
+
+# Check webhook status
+make status
+
+# Test with example pod
+make test-example
+
+# Restart webhook
+make restart
+
+# Complete pipeline (build, push, certs, deploy)
+make all
+
+# Clean up everything
+make clean
+```
+
+**Example workflow:**
+
+```bash
+# 1. First, download dependencies
+make deps
+
+# 2. Build locally to test
+make build
+
+# 3. Build Docker image (update IMAGE_NAME in Makefile first)
+make docker-build
+
+# 4. Push to registry
+make docker-push
+
+# 5. Generate certificates
+make certs
+
+# 6. Deploy to cluster
+make deploy
+
+# 7. Check status
+make status
+
+# 8. Watch logs
+make logs
+```
+
+**Customizing:**
+
+You can override variables:
+
+```bash
+# Use custom image name
+make docker-build IMAGE_NAME=myregistry.com/irsa-webhook IMAGE_TAG=v1.0.0
+
+# Use custom namespace
+make deploy NAMESPACE=custom-namespace
+```