fix: link to commit hash for external deployment

Close #72

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.11.0
+FROM alpine:3.11.2
 
 RUN apk add --no-cache \
     bash \

entrypoint.sh

@@ -117,7 +117,13 @@ git remote add origin "${remote_repo}"
 git add --all
 
 print_info "Allowing empty commits: ${INPUT_EMPTYCOMMITS}"
-COMMIT_MESSAGE="Automated deployment: $(date -u) ${GITHUB_SHA}"
+
+if [ -n "${EXTERNAL_REPOSITORY}" ]; then
+    COMMIT_MESSAGE="Automated deployment: $(date -u) ${GITHUB_REPOSITORY}@${GITHUB_SHA}"
+else
+    COMMIT_MESSAGE="Automated deployment: $(date -u) ${GITHUB_SHA}"
+fi
+
 if [[ ${INPUT_EMPTYCOMMITS} == "false" ]]; then
     git commit -m "${COMMIT_MESSAGE}" || skip
 else