Loadtest - osquery_perf - Removal of fleet_image requirement (#35365)

- Adds support for `enroll.sh`, to deploy osquery_perf in batches
- Merges variables `tag` and `git_branch` into `git_tag_branch`. Only
one tag or git_branch should be specified.
  - Still used for osquery_perf to check out the correct tag/branch.
- Removes fleet_image requirement for cutting osquery_perf images

---------

Co-authored-by: Robert Fairburn <8029478+rfairburn@users.noreply.github.com>

.github/workflows/loadtest-osquery-perf.yml

@@ -7,20 +7,19 @@ on:
         description: "Terraform workspace that you will be deploying to."
         type: string
         required: true
-      tag:
-        description: "Tag for osquery-perf deployment"
-        type: string
-        default: "v4.72.0"
-        required: true
-      git_branch:
-        description: "git branch for osquery-perf deployment"
+      git_tag_branch:
+        description: "git Tag or Branch to use for osquery-perf deployment"
         type: string
         default: "main"
         required: true
       loadtest_containers:
-        description: "Count of osquery-perf tasks to run"
+        description: "Deploys osquery-perf containers all at once. Total number of osquery-perf tasks to run (should be a multiple of 8, if setting loadtest_containers_starting_index). This is also used as the end index in enroll.sh"
         type: string
         required: true
+      loadtest_containers_starting_index:
+        description: "Optional: Starting Index for enroll.sh (should be a multiple of 8)."
+        type: string
+        required: false
       extra_flags:
         description: "Extra flags for osquery-perf. Example: [\"--orbit_prob\", \"0.0\"]"
         type: string
@@ -52,8 +51,7 @@ env:
   TF_ACTIONS_WORKING_DIR: infrastructure/loadtesting/terraform/osquery_perf
   TF_VAR_extra_flags: "${{ inputs.extra_flags || '[]' }}"
   TF_VAR_loadtest_containers: "${{ inputs.loadtest_containers }}"
-  TF_VAR_tag: "${{ inputs.tag }}"
-  TF_VAR_git_branch: "${{ inputs.git_branch }}"
+  TF_VAR_git_tag_branch: "${{ inputs.git_tag_branch }}"
 
 permissions:
   id-token: write
@@ -145,7 +143,12 @@ jobs:
           if [[ `terraform workspace show` = "${{ inputs.terraform_workspace }}" ]];
           then
             echo "TERRAFORM WORKSPACE: MATCHES - ${{ inputs.terraform_workspace }}"
-            terraform apply -auto-approve
+            if [[ ${{ inputs.loadtest_containers_starting_index}} -gt "0" ]];
+            then
+              ./enroll.sh ${{ inputs.git_tag_branch }} ${{ inputs.loadtest_containers_starting_index}} ${{ inputs.loadtest_containers }}
+            else
+              terraform apply -auto-approve
+            fi
           else
             echo "TERRAFORM WORKSPACE: DOES NOT MATCH INPUT - ${{ inputs.terraform_workspace }}"
           fi
@@ -202,4 +205,4 @@ jobs:
             fi
           else
             echo "TERRAFORM WORKSPACE: DOES NOT MATCH INPUT - ${{ inputs.terraform_workspace }}"
-          fi
+          fi