ogcp: show checksum in image info

Improve potential image troubleshooting within ogCP.
Add checksum to the image info view.

Show "Unknown" when no checksum is available.

ogcp/forms/action_forms.py

@@ -234,6 +234,7 @@ class ImageDetailsForm(FlaskForm):
     modified = StringField(label=_l('Last update'))
     permissions = StringField(label=_l('Permissions'))
     software_id = StringField(label=_l('Software id'))
+    checksum = StringField(label=_l('Checksum'))
 
 class ServerForm(FlaskForm):
     name = StringField(label=_l('Name'),

ogcp/views.py

@@ -3400,6 +3400,12 @@ def action_image_info():
     form.software_id.data = image['software_id']
     form.description.data = image['description']
 
+    checksum = image.get('checksum', _('Unknown'))
+    if not checksum:
+        checksum = _('Unknown')
+
+    form.checksum.data = checksum
+
     try:
         responses = get_images_grouped_by_repos()
     except ServerError: