Speed up starting and stopping the OpenSearch dev container

This puts the process under the control of a process manager
(`tini` specifically) so it can handle signals better.

cf. opensearch-project/opensearch-build#3229 (comment)

Author: JulianKniephoff

Diff for: docs/scripts/devel-dependency-containers/docker-compose-all-sql.yml

@@ -3,6 +3,7 @@ services:
   elasticsearch:
     container_name: opencast-opensearch
     image: opensearchproject/opensearch:1
+    init: true
     ports:
       - 127.0.0.1:9200:9200
       - 127.0.0.1:9300:9300

Diff for: docs/scripts/devel-dependency-containers/docker-compose-mariadb.yml

@@ -3,6 +3,7 @@ services:
   elasticsearch:
     container_name: opencast-opensearch
     image: opensearchproject/opensearch:1
+    init: true
     ports:
       - 127.0.0.1:9200:9200
       - 127.0.0.1:9300:9300

Diff for: docs/scripts/devel-dependency-containers/docker-compose-postgresql.yml

@@ -3,6 +3,7 @@ services:
   elasticsearch:
     container_name: opencast-opensearch
     image: opensearchproject/opensearch:1
+    init: true
     ports:
       - 127.0.0.1:9200:9200
       - 127.0.0.1:9300:9300

Diff for: docs/scripts/devel-dependency-containers/docker-compose.yml

@@ -3,6 +3,7 @@ services:
   elasticsearch:
     container_name: opencast-opensearch
     image: opensearchproject/opensearch:1
+    init: true
     ports:
       - 127.0.0.1:9200:9200
       - 127.0.0.1:9300:9300