Add GitHub deployment support (#1291)

## Description:

Add GitHub deployment support. Fixes #1098

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

deploy.sh

@@ -81,7 +81,11 @@ if [ -z "$DOCKER_USERNAME" ] || [ -z "$DOCKER_REPO" ]; then
     exit 1
 fi
 
-DOCKER_IMAGE="${DOCKER_USERNAME}/${DOCKER_REPO}:${VERSION_TAG}"
+if [[ "$VERSION_TAG" == sha256:* ]]; then
+    DOCKER_IMAGE="${DOCKER_USERNAME}/${DOCKER_REPO}@${VERSION_TAG}"
+else
+    DOCKER_IMAGE="${DOCKER_USERNAME}/${DOCKER_REPO}:${VERSION_TAG}"
+fi
 
 if [ "$HOST" == "staging" ]; then
     print_header "DEPLOYING TO STAGING HOST"