Update base image to alpine:3.12.6
Update base image to alpine:3.12.6

Alpine 3.12.5 has a known vulnerability:
  High severity vulnerability found in busybox/busybox
  Description: Improper Handling of Exceptional Conditions
  Info: https://snyk.io/vuln/SNYK-ALPINE312-BUSYBOX-1089799
  Introduced through: busybox/busybox@1.31.1-r19, alpine-baselayout/alpine-baselayout@3.2.0-r7, busybox/ssl_client@1.31.1-r19
  From: busybox/busybox@1.31.1-r19
  From: alpine-baselayout/alpine-baselayout@3.2.0-r7 > busybox/busybox@1.31.1-r19
  From: busybox/ssl_client@1.31.1-r19
  Fixed in: 1.31.1-r20

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