Makefile: Add build target for DigitalOcean cloud image

Makefile

@@ -1,4 +1,6 @@
-.PHONY: build dev npm dep dep-go dep-js dep-list dep-tensorflow dep-upgrade dep-upgrade-js test install fmt upgrade start stop;
+.PHONY: all build dev npm dep dep-go dep-js dep-list dep-tensorflow dep-upgrade dep-upgrade-js \
+		test test-js test-go install generate fmt fmt-go fmt-imports fmt-js upgrade start stop \
+		terminal root-terminal packer-digitalocean acceptance clean tidy;
 .SILENT: ;               # no need for @
 .ONESHELL: ;             # recipes execute in same shell
 .NOTPARALLEL: ;          # wait for target to finish
@@ -201,6 +203,9 @@ docker-webdav:
 	docker pull --platform=arm64 golang:1
 	docker pull --platform=arm golang:1
 	scripts/docker-buildx.sh webdav linux/amd64,linux/arm64,linux/arm $(DOCKER_TAG)
+packer-digitalocean:
+	$(info Buildinng DigitalOcean marketplace image...)
+	(cd ./docker/examples/cloud && packer build digitalocean.json)
 lint-js:
 	(cd frontend &&	npm run lint)
 fmt-js:

docker/examples/cloud/digitalocean.json

@@ -1,10 +1,10 @@
 {
   "variables": {
     "do_token": "{{env `DIGITALOCEAN_TOKEN`}}",
-    "image_name": "photoprism-{{timestamp}}",
+    "image_name": "photoprism-ce-marketplace-{{timestamp}}",
     "apt_packages": "software-properties-common apt-transport-https ca-certificates openssl ufw curl",
     "application_name": "PhotoPrism",
-    "application_version": "{{timestamp}}"
+    "application_version": "latest"
   },
   "sensitive-variables": ["do_token"],
   "builders": [
@@ -55,8 +55,6 @@
     {
       "type": "shell",
       "environment_vars": [
-        "application_name={{user `application_name`}}",
-        "application_version={{user `application_version`}}",
         "DEBIAN_FRONTEND=noninteractive",
         "LC_ALL=C",
         "LANG=en_US.UTF-8",