Add Github Actions CI for charm operators

Builds images locally with `latest` tag, and includes new bundle for
testing purposes that sets operator docker images to `latest` as well
instead of a particular revision.

.github/workflows/test-microk8s.yaml

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+name: Charmed Katib
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out repo
+      uses: actions/checkout@v2
+
+    - name: Install dependencies
+      run: |
+        set -eux
+        sudo snap install microk8s --classic
+        sudo snap install charm --classic
+        sudo snap install juju --classic
+        sudo snap install juju-helpers --classic
+        sudo snap install juju-wait --classic
+        sudo apt update
+
+    - name: Set up dependencies
+      run: |
+        set -eux
+        sudo usermod -a -G microk8s $USER
+        sudo microk8s enable dns storage rbac
+
+    - name: Build Docker images
+      run: |
+        set -eux
+        ./scripts/v1beta1/build.sh -r docker.io/kubeflowkatib -t latest
+        for image in katib-ui katib-controller katib-db-manager; do
+          sudo docker save docker.io/kubeflowkatib/$image > $image.tar
+          sudo microk8s ctr image import $image.tar
+        done
+
+    - name: Deploy Katib
+      run: |
+        set -eux
+        cd operators/
+        git clone git://git.launchpad.net/canonical-osm
+        cp -r canonical-osm/charms/interfaces/juju-relation-mysql mysql
+        sudo juju bootstrap microk8s uk8s
+        sudo juju add-model katib
+        sudo juju bundle deploy -b bundle-edge.yaml --build
+        sudo juju wait -wvt 300
+
+    - name: Test Katib
+      run: |
+        set -eux
+        sudo microk8s kubectl run \
+            --rm \
+            -i \
+            --restart=Never \
+            --image=ubuntu \
+            katib-check \
+            -- \
+            bash -c "apt update && apt install -y curl && curl -f http://katib-ui.katib.svc.cluster.local:8080/katib/"
+
+
+    - name: Get pod statuses
+      run: sudo microk8s kubectl get all -A
+      if: failure()
+
+    - name: Get juju status
+      run: sudo juju status
+      if: failure()
+
+    - name: Get katib-controller logs
+      run: sudo microk8s kubectl logs --tail 100 -nkatib -ljuju-app=katib-controller
+      if: failure()
+
+    - name: Get katib-ui logs
+      run: sudo microk8s kubectl logs --tail 100 -nkatib -ljuju-app=katib-ui
+      if: failure()
+
+    - name: Get katib-manager logs
+      run: sudo microk8s kubectl logs --tail 100 -nkatib -ljuju-app=katib-manager
+      if: failure()

operators/bundle-edge.yaml

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+bundle: kubernetes
+applications:
+  katib-controller:
+    charm: katib-controller
+    scale: 1
+    resources:
+      oci-image: docker.io/kubeflowkatib/katib-controller:latest
+  katib-db:
+    charm: cs:~charmed-osm/mariadb-k8s
+    scale: 1
+    options:
+      database: katib
+  katib-db-manager:
+    charm: katib-db-manager
+    scale: 1
+    resources:
+      oci-image: docker.io/kubeflowkatib/katib-db-manager:latest
+  katib-ui:
+    charm: katib-ui
+    scale: 1
+    resources:
+      oci-image: docker.io/kubeflowkatib/katib-ui:latest
+relations:
+- [katib-db-manager, katib-db]