Install terraform for github actions that need it

The image in use for our ci actions, ubuntu-latest is now defaulting to
ubuntu-24.04.  In the previous version, terraform was installed by
default but has now been removed so we install it manually for each job
that relies on it.

actions/runner-images#10636

We choose not to pin the version of terraform that is installed so we
are always testing against the the latest CLI version. If there is a
discrepancy between versions that only affects tests, developers can
update to the latest version and ensure the tests work for that.

.github/workflows/acceptance-tests.yml

@@ -14,6 +14,11 @@ jobs:
           go-version-file: 'go.mod'
           cache: true
 
+      # We don't pin the version of terraform to ensure the tests run against
+      # the latest CLI version.
+      - name: Install terraform
+        uses: hashicorp/setup-terraform@v3
+
       - name: Tests
         run: make testacc
         env:

.github/workflows/ci.yaml

@@ -46,6 +46,11 @@ jobs:
         with:
           go-version: 1.22
 
+      # We don't pin the version of terraform to ensure the tests run against
+      # the latest CLI version.
+      - name: Install terraform
+        uses: hashicorp/setup-terraform@v3
+
       - name: Tests
         run: make test
 
@@ -72,6 +77,13 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v4
 
+      # Terraform fmt is run on the docs directory, don't bother pinning this
+      # version.  This will install the latest version. If there is a difference
+      # in format between the latest version and the local version, the
+      # developer should update.
+      - name: Install terraform
+        uses: hashicorp/setup-terraform@v3
+
       - name: Build docs
         run: make generate
 

.github/workflows/pre-release-ci.yaml

@@ -19,6 +19,11 @@ jobs:
         with:
           go-version: 1.22
 
+      # We don't pin the version of terraform to ensure the tests run against
+      # the latest CLI version.
+      - name: Install terraform
+        uses: hashicorp/setup-terraform@v3
+
       - name: Tests
         run: make testacc
         env: