Extend tests to use lockfile if available

This commints allows the test framework to use a lockfile generated
within the tools/lockfile directory. This allows reusing the provider
cache and also running tests in parallel.

.github/actions/fabric-tests/action.yml

@@ -46,6 +46,17 @@ runs:
         echo 'disable_checkpoint = true' \
           | tee -a /home/runner/.terraformrc
         mkdir -p ${{ env.TF_PLUGIN_CACHE_DIR }}
+
+    - uses: actions/download-artifact@v3
+      with:
+        name: lockfile
+
+    - name: Cache Terraform
+      uses: actions/cache@v3
+      with:
+        path: ${{ env.TF_PLUGIN_CACHE_DIR }}
+        key: ${{ runner.os }}-terraform-${{ hashFiles('tools/lockfile/.terraform.lock.hcl') }}
+
     # avoid conflicts with user-installed providers on local machines
     - name: Pin provider versions
       shell: bash

.github/workflows/tests.yml

@@ -31,8 +31,37 @@ env:
   TF_VERSION: 1.4.4
 
 jobs:
+  setup-tf-providers:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: hashicorp/setup-terraform@v2
+        with:
+          terraform_version: ${{ env.TERRAFORM_VERSION }}
+          terraform_wrapper: false
+
+      - name: Cache Terraform
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.TF_PLUGIN_CACHE_DIR }}
+          key: ${{ runner.os }}-terraform-${{ hashFiles('tools/lockfile/.terraform.lock.hcl') }}
+
+      - shell: bash
+        run: |
+          mkdir -p ${{ env.TF_PLUGIN_CACHE_DIR }}
+          cd tools/lockfile
+          terraform init
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: lockfile
+          path: tools/lockfile/.terraform.lock.hcl
+
+
   examples-blueprints:
     runs-on: ubuntu-latest
+    needs: setup-tf-providers
     steps:
       - uses: actions/checkout@v3
 
@@ -47,6 +76,7 @@ jobs:
 
   examples-modules:
     runs-on: ubuntu-latest
+    needs: setup-tf-providers
     steps:
       - uses: actions/checkout@v3
 
@@ -61,6 +91,7 @@ jobs:
 
   blueprints:
     runs-on: ubuntu-latest
+    needs: setup-tf-providers
     steps:
       - uses: actions/checkout@v3
 
@@ -75,6 +106,7 @@ jobs:
 
   modules:
     runs-on: ubuntu-latest
+    needs: setup-tf-providers
     steps:
       - uses: actions/checkout@v3
 
@@ -89,6 +121,7 @@ jobs:
 
   fast:
     runs-on: ubuntu-latest
+    needs: setup-tf-providers
     steps:
       - uses: actions/checkout@v3