Fix orka-* task as per pipelines 0.24+

Add a parameter through which we can set the `HOME` env variable which
if not provided will default to `/tekton/home`. Also set the default
`workingDir` as `/workspace`.

Signed-off-by: vinamra28 <vinjain@redhat.com>

task/orka-deploy/0.1/orka-deploy.yaml

@@ -88,6 +88,15 @@ spec:
       description: |
         The name of the key in the VM name config map, which stores the name of the generated VM configuration.
       default: vm-name
+    - name: user-home
+      type: string
+      default: /tekton/home
+      description: Absolute path to the user's home directory.
+  stepTemplate:
+    env:
+      - name: HOME
+        value: $(params.user-home)
+    workingDir: /workspace
   steps:
     - name: copy-script
       image: docker.io/macstadium/orka-tekton-runner:2020-10-23-a93757dc-0.1@sha256:e8ed3370dcb91cdb8bcd4e9a7e9f6652879d80acdab9644cda69a98cd8c93339

task/orka-full/0.1/orka-full.yaml

@@ -91,6 +91,15 @@ spec:
         If ssh-key is true, this parameter should specify the name of the key in
         the VM SSH credentials secret that holds the private SSH key.
       default: password
+    - name: user-home
+      type: string
+      default: /tekton/home
+      description: Absolute path to the user's home directory.
+  stepTemplate:
+    env:
+      - name: HOME
+        value: $(params.user-home)
+    workingDir: /workspace
   steps:
     - name: copy-script
       image: docker.io/macstadium/orka-tekton-runner:2020-10-23-a93757dc-0.1@sha256:e8ed3370dcb91cdb8bcd4e9a7e9f6652879d80acdab9644cda69a98cd8c93339