fix decryption shell (#281)

Signed-off-by: Rishav Dhar <19497993+RDhar@users.noreply.github.com>

.github/workflows/tf_sample.yaml

@@ -56,6 +56,6 @@ jobs:
           arg_backend_config: ${{ contains(matrix.dir, 'bucket') && format('backend/{0}.tfbackend', matrix.env) || '' }}
           arg_var_file: ${{ contains(matrix.dir, 'instance') && format('env/{0}.tfvars', matrix.env) || '' }}
           arg_workspace: ${{ matrix.env }}
-          encrypt_passphrase: ${{ secrets.TF_ENCRYPTION }}
           arg_or_create: true
           cache_plugins: true
+          encrypt_passphrase: ${{ secrets.TF_ENCRYPTION }}

action.js

@@ -305,7 +305,7 @@ module.exports = async ({ context, core, exec, github }) => {
 
         // Decrypt the TF plan file if encrypted.
         if (process.env.encrypt_passphrase) {
-          await exec.exec("/bin/bash", ["TEMP_FILE=$(mktemp)"]);
+          await exec.exec("/bin/bash", ["-c", "TEMP_FILE=$(mktemp)"]);
           await exec.exec("printf", ["%s", process.env.encrypt_passphrase, `> "$TEMP_FILE"`]);
           await exec.exec("openssl", [
             "enc",