Fix obtain-oidc-id-token - change shell to bash (#690)

Author: ilia-medvedev-codefresh

incubating/obtain-oidc-id-token/step.yaml

@@ -1,7 +1,7 @@
 version: '1.0'
 kind: step-type
 metadata:
-  version: 1.2.2
+  version: 1.2.3
   name: obtain-oidc-id-token
   description: >-
     Obtain ID token from Codefresh OIDC Provider
@@ -108,6 +108,7 @@ spec:
     main:
       name: obtain-oidc-id-token
       image: quay.io/codefreshplugins/curl-jq
+      shell: bash
       environment:
         - 'AUDIENCE=${{AUDIENCE}}'
       commands: