Fix building analytics image for multiple environments

The current commit modifies the script `analytics-dashboard.mk` in the
`govtool` directory to address the issue of building the analytics image
for multiple environments. Previously, the image tag was being generated
based on the latest commit hash for the `analytics-dashboard`, which was
not sufficient for distinguishing between different environments. To
solve this, the script now appends the `$(env)` variable to the image
tag, allowing for unique identification of images across various
environments.

scripts/govtool/analytics-dashboard.mk

@@ -7,7 +7,7 @@ endif
 .DEFAULT_GOAL := push-analytics-dashboard
 
 # image tags
-analytics_dashboard_image_tag := $(shell git log -n 1 --format="%H" -- $(root_dir)/govtool/analytics-dashboard)
+analytics_dashboard_image_tag := $(shell git log -n 1 --format="%H" -- $(root_dir)/govtool/analytics-dashboard)-$(env)
 
 .PHONY: build-analytics-dashboard
 build-analytics-dashboard: