chore: Add Terraform setup to the testing pipeline (#2579)

To speed up acceptance tests we can setup Terraform before and point the
testing framework to the Terraform CLI location. Because of that, It
won't be downloaded for every test (which was most likely happening
before this change).

.github/workflows/tests.yml

@@ -44,6 +44,13 @@ jobs:
       - run: make test
         if: steps.create_config.conclusion == 'success'
 
+      - name: Setup Terraform
+        if: steps.create_config.conclusion == 'success'
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: 1.7.4
+          terraform_wrapper: false
+
       - run: make test-acceptance
         if: steps.create_config.conclusion == 'success'