deps: bump alpine from 3.11.2 to 3.11.3

Bumps alpine from 3.11.2 to 3.11.3.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.11.2
+FROM alpine:3.11.3
 
 RUN apk add --no-cache \
     bash \

entrypoint.sh

@@ -53,7 +53,7 @@ elif [ -n "${GITHUB_TOKEN}" ]; then
     print_error "GITHUB_TOKEN works only private repo, See #9"
 
     if [ -n "${EXTERNAL_REPOSITORY}" ]; then
-        print_error "can not use GITHUB_TOKEN to deploy to a external repository"
+        print_error "can not use GITHUB_TOKEN to deploy to an external repository"
         exit 1
     fi