Add entrypoint that customizes DBSync configuration

Updated the custom entrypoint script for the Cardano DB Sync container
to include advanced configuration capabilities. Changes were made to
`scripts/govtool/custom-cardano-db-sync.entrypoint.sh` to set up
necessary environment variables, handle PostgreSQL authentication via a
`pgpass` file, and include the path to `db-sync-config.json`. The
`scripts/govtool/Makefile` and
`scripts/govtool/config/templates/docker-compose.yml.tpl` files were
adjusted to support these changes by implementing new build and
deployment targets for the custom Cardano DB Sync image and updating the
Docker Compose template.

These changes ensure the DBSync process uses the correct settings,
allowing it to adapt to future updates and ensuring better
synchronization with the Cardano blockchain.

scripts/govtool/Makefile

@@ -18,7 +18,7 @@ cardano_db_sync_image_tag := sancho-5.1.0
 all: deploy-stack notify
 
 .PHONY: deploy-stack
-deploy-stack: upload-config push-backend push-frontend push-status-service push-metadata-validation push-analytics-dashboard
+deploy-stack: upload-config push-backend push-frontend push-status-service push-metadata-validation push-analytics-dashboard push-custom-cardano-db-sync
 	@:$(call check_defined, cardano_network)
 	@:$(call check_defined, env)
 	export CARDANO_NETWORK=$(cardano_network); \

scripts/govtool/config/templates/docker-compose.yml.tpl

@@ -146,7 +146,7 @@ services:
     logging: *logging
 
   cardano-db-sync:
-    image: ghcr.io/intersectmbo/cardano-db-sync:${CARDANO_DB_SYNC_TAG}
+    image: <REPO_URL>/custom-cardano-db-sync:latest
     environment:
       - NETWORK=${CARDANO_NETWORK}
       - POSTGRES_HOST=postgres
@@ -165,6 +165,7 @@ services:
     volumes:
       - db-sync-data:/var/lib/cexplorer
       - node-ipc:/node-ipc
+      - /home/<DOCKER_USER>/config/cardano-node:/configuration
     restart: always
     logging: *logging
 

scripts/govtool/custom-cardano-db-sync.entrypoint.sh

@@ -1,4 +1,39 @@
 #!/bin/sh
 echo "Custom Cardano DB Sync entrypoint"
-# TODO: Add custom logic here
-exec "$@"
+set -euo pipefail
+mkdir -p -m 1777 /tmp
+mkdir -p /configuration
+CARDANO_NODE_SOCKET_PATH=/node-ipc/node.socket
+CARDANO_DB_SYNC_CONFIG_PATH=/configuration/db-sync-config.json
+
+# set pgpass file
+echo "-> Generating PGPASS file"
+SECRET_DIR=/run/secrets
+POSTGRES_DB=${POSTGRES_DB:-$(< ${SECRET_DIR}/postgres_db)}
+POSTGRES_USER=${POSTGRES_USER:-$(< ${SECRET_DIR}/postgres_user)}
+POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-$(< ${SECRET_DIR}/postgres_password)}
+echo "${POSTGRES_HOST}:${POSTGRES_PORT}:${POSTGRES_DB}:${POSTGRES_USER}:${POSTGRES_PASSWORD}" > /configuration/pgpass
+chmod 0600 /configuration/pgpass
+export PGPASSFILE=/configuration/pgpass
+
+# wait for cardano node to start
+echo -n "-> Waiting for $CARDANO_NODE_SOCKET_PATH"
+until [ -S "$CARDANO_NODE_SOCKET_PATH" ]; do
+  echo -n "."
+  sleep 10
+done
+echo
+
+# find schema directory
+echo "-> Finding schema directory"
+SCHEMA_DIR=$(find /nix/store -type d -name '*-schema')
+
+echo "-> Running Cardano DB Sync"
+exec cardano-db-sync \
+    --config "$CARDANO_DB_SYNC_CONFIG_PATH" \
+    --socket-path "$CARDANO_NODE_SOCKET_PATH" \
+    --schema-dir "$SCHEMA_DIR" \
+    --state-dir /state \
+    $@
+
+echo "-> Cleaning up"