Ensure 'apk' add has pinned version for package

Risk Level: medium
Platform: Docker
Spectral Rule ID: DOCKR054

REMEDIATION

Add pinned version to apk add.

FROM alpine:3.16
- RUN apk add curl
+ RUN apk add curl=7.84.0-r0

Read more:

• https://docs.docker.com/develop/develop-images/dockerfile_best-practices/