Merge ~alextu/plainbox-provider-pc-sanity:sideload-changes-json into plainbox-provider-pc-sanity:master

[Alex Tu]

[Alex Tu (alextu)]

given that we can easily sideload predefined providers by checkbox-run-plan --dev [1]

This side-load-changes.json is a file providing visibility about what test cases are changed by this sideloading.

Say, the changed test cases are from any MPs that are verified but waiting for upstream to merge it.

[1]:
 - https://git.launchpad.net/~oem-solutions-engineers/pc-enablement/+git/prepare-checkbox-sanity/tree/usr/sbin/checkbox-run-plan#n22
 - https://git.launchpad.net/~oem-solutions-engineers/pc-enablement/+git/prepare-checkbox-sanity/tree/usr/sbin/prepare-checkbox-sanity#n19

[Alex Tu (alextu)]

an example of added attachement could be found there: http://10.101.46.50:8080/job/sanity-3-testflinger-dell-bto-focal-fossa-201810-26535-staging/317/

[Yuan-Chen Cheng (ycheng-twn)]

LGTM as developments helper.

review: Approve

[Cyrus Lien (cyruslien)]

review: Approve

diff --git a/units/pc-sanity/pc-sanity-misc.pxu b/units/pc-sanity/pc-sanity-misc.pxu
index 1b51696..c61f448 100644
--- a/units/pc-sanity/pc-sanity-misc.pxu
+++ b/units/pc-sanity/pc-sanity-misc.pxu
@@ -93,3 +93,10 @@ command: dpkg -l
 _description:
  attache log from dpkg -l
 
+plugin: attachment
+category_id: com.canonical.plainbox::miscellanea
+id: miscellanea/side-load-changes
+estimated_duration: 1.0
+command: cat /var/tmp/checkbox-providers/*/side-load-changes.json || true
+_description:
+ attach what changed from sideloading.
diff --git a/units/pc-sanity/pc-sanity.pxu b/units/pc-sanity/pc-sanity.pxu
index 286af19..93c7194 100644
--- a/units/pc-sanity/pc-sanity.pxu
+++ b/units/pc-sanity/pc-sanity.pxu
@@ -5,6 +5,7 @@ _description:
     This test plan is for smoke test as sanity before release image.
 include:
     com.canonical.certification::miscellanea/dpkg-l
+    com.canonical.certification::miscellanea/side-load-changes
     com.canonical.certification::somerville-installation
     com.canonical.certification::somerville/platform-meta-test
     com.canonical.certification::misc/generic/grub_boothole