PRODENG-3392: run PR & smoke workflows on self-hosted runners (#611)

Move PR validation and smoke tests onto the internal
`arc-runner-set-mirantis-public` runner set to reduce reliance on
GitHub-hosted runners.

- pr.yml: switch `lint` to arc-runner-set-mirantis-public (unit-test,
  integration-test, and security-scan stay on ubuntu-latest for now).
- smoke-tests.yaml: switch smoke-modern / smoke-legacy / smoke-windows /
  smoke-upgrade to arc-runner-set-mirantis-public. The runner image
  ships without Go and its Node runtime does not satisfy
  hashicorp/setup-terraform's wrapper, so also:
    * install Go via `actions/setup-go@v6` (go-version-file: go.mod,
      cache: true) before `make smoke-*` in every smoke job;
    * pass `terraform_wrapper: false` to `hashicorp/setup-terraform@v3`
      so the raw `terraform` binary lands on PATH. Without this,
      terratest's `defaultTerraformExecutable()` probe
      (`terraform -version` with nil stdio) fails against the Node
      wrapper and falls back to `tofu`, which is not installed:
        exec: "tofu": executable file not found in $PATH
- go.yml: scope the pull_request `paths` filter to include
  `.github/workflows/go.yml` itself so changes to the workflow retrigger
  its own checks.

Verified on run 28619416867 (HEAD c2355c6, pre-squash): smoke-modern,
smoke-legacy, and smoke-upgrade all pass on the self-hosted runner.
smoke-windows still fails with a WinRM 5986 timeout during
Reset/Connect, but this failure signature also reproduces on `main`
(ubuntu-latest, run 26822741859) and is unrelated to the runner
migration.

Co-authored-by: pgedara <pgedara@users.noreply.github.com>

Author: pgedara

.github/workflows/go.yml

@@ -7,6 +7,7 @@ on:
       - go.mod
       - go.sum
       - Makefile
+      - '.github/workflows/go.yml'
 
 jobs:
   unit-test:

.github/workflows/pr.yml

@@ -24,7 +24,7 @@ on:
 jobs:
   lint:
     name: Lint Code
-    runs-on: ubuntu-latest
+    runs-on: arc-runner-set-mirantis-public
     env:
       GOTOOLCHAIN: auto
 

.github/workflows/smoke-tests.yaml

@@ -19,67 +19,95 @@ permissions:
 
 jobs:
   smoke-modern:
-    runs-on: ubuntu-latest
+    runs-on: arc-runner-set-mirantis-public
     if: |
       github.event_name == 'push' ||
       contains(github.event.pull_request.labels.*.name, 'smoke-test') ||
       contains(github.event.pull_request.labels.*.name, 'smoke-modern')
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_wrapper: false
       - name: Run modern smoke test
         env:
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         run: make smoke-modern
 
   smoke-legacy:
-    runs-on: ubuntu-latest
+    runs-on: arc-runner-set-mirantis-public
     if: |
       github.event_name == 'push' ||
       contains(github.event.pull_request.labels.*.name, 'smoke-test') ||
       contains(github.event.pull_request.labels.*.name, 'smoke-legacy')
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_wrapper: false
       - name: Run legacy smoke test
         env:
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         run: make smoke-legacy
 
   smoke-windows:
-    runs-on: ubuntu-latest
+    runs-on: arc-runner-set-mirantis-public
     if: |
       github.event_name == 'push' ||
       contains(github.event.pull_request.labels.*.name, 'smoke-test') ||
       contains(github.event.pull_request.labels.*.name, 'smoke-windows')
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_wrapper: false
       - name: Run windows smoke test
         env:
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         run: make smoke-windows
 
   smoke-upgrade:
-    runs-on: ubuntu-latest
+    runs-on: arc-runner-set-mirantis-public
     if: |
       github.event_name == 'push' ||
       contains(github.event.pull_request.labels.*.name, 'smoke-test') ||
       contains(github.event.pull_request.labels.*.name, 'smoke-upgrade')
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_wrapper: false
       - name: Run upgrade smoke test
         env:
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}