Merge ~esunar/charm-prometheus-blackbox-exporter:fix-functional-tests into charm-prometheus-blackbox-exporter:master

[Erhan Sunar]

fix build issue

the build issue wax caused by the changes in layer-basic
https://github.com/juju-solutions/layer-basic/issues/215

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 prod-jenkaas-bootstack (prod-jenkaas-bootstack)]

PASSED: Continuous integration, rev:fcf29d12986796f8e28a1619958f9808bcb9dde8
https://jenkins.canonical.com/bootstack/job/lp-charm-prometheus-blackbox-exporter-ci/1/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-functest/729/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/232/

Click here to trigger a rebuild:
https://jenkins.canonical.com/bootstack/job/lp-charm-prometheus-blackbox-exporter-ci/1//rebuild

review: Approve (continuous-integration)

[Robert Gildein (rgildein)]

review: Approve

[Eric Chen (eric-chen)]

review: Approve

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 0b797b72a5a960bb6e7a2a7aa16fd3e21fba6552

diff --git a/charmcraft.yaml b/charmcraft.yaml
index 7187921..b9a51c4 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -4,6 +4,7 @@ parts:
     source: src
     plugin: reactive
     build-snaps: [charm]
+    build-packages: [python3-dev]
 bases:
     - build-on:
         - name: ubuntu