Migration from TIBCO BPM to CAMUNDA 8 sizing requirement for CAMUNDA 8 Installation

[Sreenivas1209]

HI, We are doing migration from TIBCO BPM to CAMUNDA 8 Self Managed. As part of this we have installed Kubernates in Redhat Linux box with 1 master node with 2 worker nodes. on top of this I am installing CAMUNDA 8.
Master and worker nodes have memories like below after Kubernates and CAMUNDA 8 Installation.
Master Node as below -
#df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root 4.0G 104M 3.9G 3% /
#free -h
total used free shared buff/cache available
Mem: 7.5Gi 2.2Gi 973Mi 330Mi 4.4Gi 4.7Gi
Swap: 0B 0B 0B

1st Worker Node as below -

df -h /

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root 4.0G 95M 3.9G 3% /

free -h

                total        used        free        shared   buff/cache   available

Mem: 5.5Gi 2.3Gi 879Mi 279Mi 2.4Gi 2.7Gi
Swap: 0B 0B 0B

2nd Worker Node as below -

df -h /

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root 4.0G 95M 3.9G 3% /

free -h

              total        used        free      shared  buff/cache   available

Mem: 5.5Gi 2.0Gi 445Mi 286Mi 3.1Gi 3.0Gi
Swap: 0B 0B 0B

Issue
After installing Camunda all pods of CAMUNDA is not getting up and running.

Ealstic search pods are not getting to ready state due to below issues
0/3 nodes are available: 1 node(s) had untolerated taint {node-role.kubernetes.io/control-plane: }, 2 Insufficient cpu. preemption: 0/3 nodes are available: 1 Preemption is not helpful for scheduling, 2 No preemption victims found for incoming pod.

so i made master node also to work as worker node.. after making this change i dont see "1 node(s) had untolerated taint {node-role.kubernetes.io/control-plane" issue.. but still am getting "Insufficient cpu. preemption: 0/3 nodes are available: 1 Preemption is not helpful for scheduling, 2 No preemption victims found for incoming pod",

Can someonehelp what is the minimum sizing and cpus/RAM/memories required for Camunda 8 self managed with Kubernates setup in redhat linux box required? please node that its for dev environment..