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_2x2/docker-compose.yaml

@@ -2,6 +2,7 @@ services:
     mysql:
         container_name: "rfsim5g-mysql"
         image: mysql:8.0
+        init: true
         volumes:
             - ../5g_rfsimulator/oai_db.sql:/docker-entrypoint-initdb.d/oai_db.sql
             - ../5g_rfsimulator/mysql-healthcheck.sh:/tmp/mysql-healthcheck.sh
@@ -13,6 +14,8 @@ 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
@@ -46,6 +49,7 @@ services:
     oai-upf:
         container_name: "rfsim5g-oai-upf"
         image: oaisoftwarealliance/oai-upf:v2.1.9
+        init: true
         environment:
             - TZ=Europe/Paris
         volumes:
@@ -67,6 +71,7 @@ services:
         privileged: true
         container_name: rfsim5g-oai-ext-dn
         image: oaisoftwarealliance/trf-gen-cn5g:focal
+        init: true
         entrypoint: /bin/bash -c \
               "iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE;"\
               "ip route add 12.1.1.0/24 via 192.168.72.134 dev eth0; sleep infinity"
@@ -77,6 +82,8 @@ 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 +104,8 @@ services:
             - ../../conf_files/gnb.sa.band78.273prb.rfsim.2x2.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
@@ -123,6 +132,8 @@ services:
             - ../../conf_files/nrue.uicc.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