fix: Dockerfile to reduce vulnerabilities (#6)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5776809
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5776809

Co-authored-by: snyk-bot <[email protected]>

Author: amuraru

Dockerfile

@@ -27,7 +27,7 @@ RUN CGO_ENABLED=0 go build \
 ############################################################
 # Runtime Image
 ############################################################
-FROM alpine:3.17
+FROM alpine:3
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /app/bin/kminion /app/kminion
 RUN chmod -R +x /app/kminion