use built-in envs

.dockerignore

 /ssh
-/config
 
 .git*
 Dockerfile
+config.example
+README.md
+LICENSE

.gitignore

 /ssh
-/config

config.example

-export GOVC_USERNAME=administrator@example.com
-export GOVC_PASSWORD=password_here
-export GOVC_URL=vc.example.com
-
-export DATACENTER=example
-export VC_HOST=host.example.com
-export RESOURCE_POOL=example
-export DATASTORE=example-datastore1
-export NETWORK=example-runners
-export TEMPLATE=runner-template-example
-export CPU_COUNT=2
-export MEM_COUNT=4096
-export SSH_USER=root

src/base

@@ -6,5 +6,5 @@ source ${currentDir}/../config # config file
 VM_ID="runner-$CUSTOM_ENV_CI_RUNNER_ID-project-$CUSTOM_ENV_CI_PROJECT_ID-concurrent-$CUSTOM_ENV_CI_CONCURRENT_PROJECT_ID-job-$CUSTOM_ENV_CI_JOB_ID"
 
 _get_vm_ip() {
-    govc vm.info "-dc=$DATACENTER" -json "$VM_ID" | jq .VirtualMachines[0].Guest.IpAddress | sed 's/"//g'
+    govc vm.info "-dc=$VC_DATACENTER" -json "$VM_ID" | jq .VirtualMachines[0].Guest.IpAddress | sed 's/"//g'
 }

src/cleanup.sh

@@ -8,4 +8,4 @@ source ${currentDir}/base # Get variables from base script.
 set -eo pipefail
 
 # Destroy VM.
-govc vm.destroy "-dc=$DATACENTER" "$VM_ID"
+govc vm.destroy "-dc=$VC_DATACENTER" "$VM_ID"

src/prepare.sh

@@ -11,7 +11,7 @@ set -eo pipefail
 trap "exit $SYSTEM_FAILURE_EXIT_CODE" ERR
 
 # Install the VM
-govc vm.clone "-dc=$DATACENTER" -on=true -waitip=true "-vm=$TEMPLATE" "-host=$VC_HOST" "-pool=$RESOURCE_POOL" "-ds=$DATASTORE" "-net=$NETWORK" "-c=$CPU_COUNT" "-m=$MEM_COUNT" "$VM_ID"
+govc vm.clone "-dc=$VC_DATACENTER" -on=true -waitip=true "-vm=$VC_TEMPLATE" "-host=$VC_HOST" "-pool=$VC_RESOURCE_POOL" "-ds=$VC_DATASTORE" "-net=$VC_NETWORK" "-c=$VC_CPUS" "-m=$VC_MEMS" "$VM_ID"
 
 # Wait for VM to get IP
 echo 'Waiting for VM to get IP'
@@ -36,7 +36,7 @@ done
 # Wait for ssh to become available
 echo "Waiting for sshd to be available"
 for i in $(seq 1 30); do
-    if ssh -i "${currentDir}/../ssh/id_rsa" -o StrictHostKeyChecking=no "$SSH_USER@$VM_IP" >/dev/null 2>/dev/null; then
+    if ssh -i "${currentDir}/../ssh/id_rsa" -o StrictHostKeyChecking=no "$VC_SSH_USER@$VM_IP" >/dev/null 2>/dev/null; then
         break
     fi
 

src/run.sh

@@ -7,7 +7,7 @@ source ${currentDir}/base # Get variables from base script.
 
 VM_IP=$(_get_vm_ip)
 
-ssh -i "${currentDir}/../ssh/id_rsa" -o StrictHostKeyChecking=no "$SSH_USER@$VM_IP" /bin/bash < "${1}"
+ssh -i "${currentDir}/../ssh/id_rsa" -o StrictHostKeyChecking=no "$VC_SSH_USER@$VM_IP" /bin/bash < "${1}"
 if [ $? -ne 0 ]; then
     # Exit using the variable, to make the build as failure in GitLab
     # CI.