Add support for ephemeral variables in terraform >= 1.10.0

These must be specified again when applying a saved plan, but must not be specified in earlier versions of Terraform or OpenTofu

Author: dflook

.github/workflows/test-apply.yaml

@@ -1480,7 +1480,7 @@ jobs:
 
       - name: Apply using explicit ephemeral value
         uses: ./terraform-apply
-        id: apply
+        id: apply2
         with:
           label: test-apply ephemeral 2
           path: tests/workflows/test-apply/ephemeral
@@ -1490,7 +1490,7 @@ jobs:
 
       - name: Verify outputs
         env:
-          OUTPUT_STRING: ${{ steps.apply.outputs.v }}
+          OUTPUT_STRING: ${{ steps.apply2.outputs.v }}
         run: |
           if [[ "$OUTPUT_STRING" != "hello" ]]; then
             echo "::error:: output s not set correctly"
@@ -1511,7 +1511,7 @@ jobs:
       - name: Apply using mismatched explicit non-ephemeral value
         uses: ./terraform-apply
         continue-on-error: true
-        id: apply
+        id: apply3
         with:
           label: test-apply ephemeral 3
           path: tests/workflows/test-apply/ephemeral
@@ -1521,7 +1521,7 @@ jobs:
 
       - name: Check failed to apply
         env:
-          OUTCOME: ${{ steps.apply.outcome }}
+          OUTCOME: ${{ steps.apply3.outcome }}
         run: |
           if [[ "$OUTCOME" != "failure" ]]; then
             echo "Apply did not fail correctly"

image/actions.sh

@@ -400,6 +400,8 @@ function set-plan-args() {
 
 function set-remote-plan-args() {
     set-common-plan-args
+    VARIABLE_ARGS=""
+    DEPRECATED_VAR_ARGS=""
 
     local AUTO_TFVARS_COUNTER=0