Added dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.10.0-alpine3.7
+
+WORKDIR /app
+
+RUN apk update && apk upgrade && apk add --no-cache bash git openssh
+
+COPY . ./
+
+RUN go get -u github.com/zricethezav/gitleaks
+RUN go build
+
+ENTRYPOINT ["gitleaks"]
+
+
+# How to use me :
+
+# docker build -t gitleaks .
+# docker run --rm --name=gitleaks gitleaks https://github.com/zricethezav/gitleaks
+
+# This will check for secrets in https://github.com/zricethezav/gitleaks