CI: adjust YAML files to speedup deployment/undeployment in rfsim5g

- `init: true` initializes the docker container with tini or alternative - it is
  used to collect all the processes and correctly pass the termination signal to
  them, this allows the docker container to be stopped without waiting 10 seconds
  to kill the container
- speeding up the healthchecks by reducing the interval from 1-10s to 0.5s during
  start period

Co-authored-by: Bartosz Podrygajlo <bartosz.podrygajlo@openairinterface.org>

ci-scripts/yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml

@@ -13,6 +13,8 @@ services:
             - MYSQL_ROOT_PASSWORD=linux
         healthcheck:
             test: /bin/bash -c "/tmp/mysql-healthcheck.sh"
+            start_period: 10s
+            start_interval: 500ms
             interval: 10s
             timeout: 5s
             retries: 30
@@ -77,6 +79,8 @@ services:
                 ipv4_address: 192.168.72.135
         healthcheck:
             test: /bin/bash -c "ping -c 2 192.168.72.134"
+            start_period: 10s
+            start_interval: 500ms
             interval: 10s
             timeout: 5s
             retries: 5
@@ -97,6 +101,8 @@ services:
             - ../../conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn-leo.conf:/opt/oai-gnb/etc/gnb.conf
         healthcheck:
             test: /bin/bash -c "pgrep nr-softmodem"
+            start_period: 10s
+            start_interval: 500ms
             interval: 10s
             timeout: 5s
             retries: 5
@@ -129,6 +135,8 @@ services:
             - ../../conf_files/nrue.uicc.ntn-leo.conf:/opt/oai-nr-ue/etc/nr-ue.conf
         healthcheck:
             test: /bin/bash -c "pgrep nr-uesoftmodem"
+            start_period: 10s
+            start_interval: 500ms
             interval: 10s
             timeout: 5s
             retries: 5