Add docker support

Dockerfile

@@ -0,0 +1,8 @@
+FROM golang:1.17-bullseye
+WORKDIR /app
+COPY go.mod ./
+COPY go.sum ./
+RUN go mod download
+COPY . ./
+RUN GOOS=linux go build -o /scan4log4shell 
+ENTRYPOINT ["/scan4log4shell"]

Makefile

@@ -19,6 +19,11 @@ test:
 build:
 	@go build -o scan4log4shell .
 
+.PHOMY: docker-build
+## docker-build: Build a docker image
+docker-build:
+	docker build -t scan4log4shell .
+
 .PHONY: run
 run:
 	@go run *.go remote url -h

README.md

@@ -55,6 +55,16 @@ make build
 
 (Add the appropriate .exe extension on Windows systems, of course.)
 
+## Docker Support
+```bash
+git clone https://github.com/hupe1980/scan4log4shell
+cd scan4log4shell
+make docker-build
+
+# Scan the current working directory
+docker run -it --rm -v $PWD:/data scan4log4shell local /data
+```
+
 ## Usage 
 ```console
 Usage: