[#385] Unify placeholder usage in configuration templates

Standardized the format of placeholders within template files across the
deployment setup to improve the consistency and reliability of dynamic
configuration generation. Modified `config.mk`,
`backend-config.json.tpl`, and
`grafana-provisioning/alerting/alerting.yml` to use a uniform
placeholder notation, enclosed in angle brackets (e.g.,
`<PLACEHOLDER>`), for all configurable values. This refinement
simplifies the template processing logic, ensuring a more streamlined
and error-free substitution of environment-specific values during the
deployment process, thereby enhancing the overall maintainability of the
deployment infrastructure.

scripts/govtool/config.mk

@@ -57,10 +57,10 @@ prepare-dbsync-secrets:
 
 .PHONY: prepare-backend-config
 prepare-backend-config:
-	sed -e "s/DBSYNC_POSTGRES_DB/$${DBSYNC_POSTGRES_DB}/" \
-		-e "s/DBSYNC_POSTGRES_USER/$${DBSYNC_POSTGRES_USER}/" \
-		-e "s/DBSYNC_POSTGRES_PASSWORD/$${DBSYNC_POSTGRES_PASSWORD}/" \
-		-e "s|SENTRY_DSN|$${SENTRY_DSN_BACKEND}|" \
+	sed -e "s|<DBSYNC_POSTGRES_DB>|$${DBSYNC_POSTGRES_DB}|" \
+		-e "s|<DBSYNC_POSTGRES_USER>|$${DBSYNC_POSTGRES_USER}|" \
+		-e "s|<DBSYNC_POSTGRES_PASSWORD>|$${DBSYNC_POSTGRES_PASSWORD}|" \
+		-e "s|<SENTRY_DSN>|$${SENTRY_DSN_BACKEND}|" \
 		"$(config_dir)/templates/backend-config.json.tpl" \
 		> "$(target_config_dir)/backend-config.json"
 
@@ -72,8 +72,8 @@ prepare-prometheus-config:
 prepare-grafana-provisioning:
 	mkdir -p $(grafana_provisioning_dir)
 	cp -a $(template_config_dir)/grafana-provisioning/* $(grafana_provisioning_dir)
-	sed -e "s/GRAFANA_SLACK_RECIPIENT/$${GRAFANA_SLACK_RECIPIENT}/" \
-		-e "s|GRAFANA_SLACK_OAUTH_TOKEN|$${GRAFANA_SLACK_OAUTH_TOKEN}|" \
+	sed -e "s|<GRAFANA_SLACK_RECIPIENT>|$${GRAFANA_SLACK_RECIPIENT}|" \
+		-e "s|<GRAFANA_SLACK_OAUTH_TOKEN>|$${GRAFANA_SLACK_OAUTH_TOKEN}|" \
 		-i $(grafana_provisioning_dir)/alerting/alerting.yml
 
 .PHONY: prepare-nginx-config

scripts/govtool/config/templates/backend-config.json.tpl

@@ -1,13 +1,13 @@
 {
     "dbsyncconfig" : {
         "host"     : "postgres",
-        "dbname"   : "DBSYNC_POSTGRES_DB",
-        "user"     : "DBSYNC_POSTGRES_USER",
-        "password" : "DBSYNC_POSTGRES_PASSWORD",
+        "dbname"   : "<DBSYNC_POSTGRES_DB>",
+        "user"     : "<DBSYNC_POSTGRES_USER>",
+        "password" : "<DBSYNC_POSTGRES_PASSWORD>",
         "port"     : 5432
       },
     "port" : 9876,
     "host" : "0.0.0.0",
     "cachedurationseconds": 20,
-    "sentrydsn": "SENTRY_DSN"
+    "sentrydsn": "<SENTRY_DSN>"
 }

scripts/govtool/config/templates/grafana-provisioning/alerting/alerting.yml

@@ -8,8 +8,8 @@ contactPoints:
         name: Slack GovTool
         type: slack
         settings:
-          recipient: GRAFANA_SLACK_RECIPIENT
-          token: GRAFANA_SLACK_OAUTH_TOKEN
+          recipient: <GRAFANA_SLACK_RECIPIENT>
+          token: <GRAFANA_SLACK_OAUTH_TOKEN>
         disableResolveMessage: false
 
 policies: