Integrity testing: Check published kickstart files integrity (#5689)

* netdata/packaging/ci: Integrity testing

Introduce a scriptlet that validates kickstart integrity in my-netdata.io against the ones in the repo.
Run this through the pipeline on a scheduled manner.
Will refine the conditionals later, once i verify the stage is built up as expected

* netdata/packaging/ci: remove conditionals first

* netdata/packaging/ci: Adjust the names to something more appropriate. Run it along with nightlies

* netdata/packager/ci: Cleanup checksum validation for kickstart files (continued)

1) merge validate_kickstart_integrity.sh and tests/installer/checksums.sh
2) run checksums at the new point on the pipeline
3) Change that unstable gitignore check and use a more file-agnostic check that depends only on git that we already require
4) Do not run the kickstart validation on the online website everywhere, only on the nightly runs

* netdata/packaging/ci: First rounf of PR feedback adjustments

1) changes wordings as recommended
2) pass file info in parameter and use it in the wordings
3) as shellcheck suggests, use -n instead of ! -z. Makes sense actually, ! -z is kind of reverse logic that confuses

More adjustments on a follow up commit

* netdata/packaging/ci: Enable slack integration for kickstart validation

We want to be notified in a timely manner when the kickstart on the website is outdated.
Added a wrapper for incoming webhooks from slack and instead of failing the build we notify slack

Added a debug message in the end of the script to validate the process which i will remove on a follow up commit

* netdata/packaging/ci: fixes
fix sourcing path
missed the /, this new keyboard is a pain :p

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/installer/slack.sh b/tests/installer/slack.sh
new file mode 100755
index 0000000000..817989db92
--- /dev/null
+++ b/tests/installer/slack.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# Simple incoming webhook for slack integration.
+# 
+# The script expects the following parameters to be defined by the upper layer:
+# SLACK_INCOMING_WEBHOOK_URL
+# SLACK_BOT_NAME
+# SLACK_CHANNEL
+#
+# Copyright:
+#
+# Author: Pavlos Emm. Katsoulakis <paul@netdata.cloud
+
+post_message() {
+	MESSAGE="$1"
+	curl -X POST --data-urlencode "payload={\"channel\": \"${SLACK_CHANNEL}\", \"username\": \"${SLACK_BOT_NAME}\", \"text\": \"${MESSAGE}\", \"icon_emoji\": \":space_invader:\"}" ${SLACK_INCOMING_WEBHOOK_URL}
+}