Add docker image for uploading a file to gcp

gcp-backup-upload/Dockerfile

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+FROM google/cloud-sdk:587.0.0
+
+COPY script.sh /script.sh
+
+ENTRYPOINT ["/bin/bash", "/script.sh"]

gcp-backup-upload/README.md

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+# GCP-Backup-Upload
+
+## Environment Variables
+| Name | Default | Description |
+|---|---|---|
+| FILE_TO_TRIGGER | - | TODO |
+| FILE_TO_BACKUP | - | TODO |
+| BUCKET_URL | - | TODO |
+| GCLOUD_KEY_FILE | - | TODO |

gcp-backup-upload/script.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+until [ -f ${FILE_TO_TRIGGER} ]
+do
+     sleep 5
+done
+
+gcloud auth activate-service-account --key-file ${GCLOUD_KEY_FILE};
+
+gcloud storage cp ${FILE_TO_BACKUP} ${BUCKET_URL}/;