Merge ~mthaddon/charm-k8s-discourse/+git/charm-k8s-discourse:charmcraft-yaml into charm-k8s-discourse:master

[Tom Haddon]

Add a charmcraft.yaml and update path for tox

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FAILED: Continuous integration, rev:bb013da16c36c83dfa103d472fe21eac40d84a94

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https://jenkins.canonical.com/is/job/lp-charm-k8s-discourse-ci/34/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/is/job/lp-charm-test/149/
    None: https://jenkins.canonical.com/is/job/lp-update-mp/538387/

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review: Needs Fixing (continuous-integration)

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Failed to merge change (unable to merge source repository due to conflicts), setting status to needs review.

diff --git a/Makefile b/Makefile
index d754dab..f4d845e 100644
--- a/Makefile
+++ b/Makefile
@@ -10,9 +10,7 @@ lint: blacken
 	@echo "Running flake8"
 	@tox -e lint
 
-# We actually use the build directory created by charmcraft,
-# but the .charm file makes a much more convenient sentinel.
-unittest: discourse-k8s.charm
+unittest:
 	@tox -e unit
 
 test: lint unittest
@@ -21,9 +19,6 @@ clean:
 	@echo "Cleaning files"
 	@git clean -fXd
 
-discourse-k8s.charm: src/*.py requirements.txt
-	charmcraft build
-
 build-image:
 	@echo "Building the image."
 	@docker build \
diff --git a/charmcraft.yaml b/charmcraft.yaml
 new file mode 100644
index 0000000..bf04cb1
--- /dev/null
+++ b/charmcraft.yaml
@@ -0,0 +1,8 @@
+type: charm
+bases:
+  - build-on:
+    - name: "ubuntu"
+      channel: "20.04"
+    run-on:
+    - name: "ubuntu"
+      channel: "20.04"
diff --git a/tox.ini b/tox.ini
index d48b030..3d6bf55 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,8 +5,6 @@ skip_missing_interpreters = True
 
 [testenv]
 basepython = python3
-setenv =
-  PYTHONPATH = {toxinidir}/build/lib:{toxinidir}/build/venv
 
 [testenv:unit]
 commands =
@@ -15,7 +13,7 @@ commands =
 deps = -r{toxinidir}/tests/unit/requirements.txt
        -r{toxinidir}/requirements.txt
 setenv =
-  PYTHONPATH={toxinidir}/src:{toxinidir}/build/lib:{toxinidir}/build/venv
+  PYTHONPATH = {toxinidir}/lib:{toxinidir}/src
   TZ=UTC
 
 [testenv:black]