fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE310-APKTOOLS-1534688

Author: snyk-bot

Dockerfile

@@ -19,7 +19,7 @@ RUN export ARCH=$([[ "$(uname -m)" == "aarch64" ]] && echo "arm64" || echo "amd6
     curl -o kubectl1.6 -L https://storage.googleapis.com/kubernetes-release/release/v1.6.0/bin/linux/${ARCH}/kubectl
 
 
-FROM alpine:3.10
+FROM alpine:3.14.3
 
 RUN apk add --update bash