Add GH action (#5)

.github/PULL_REQUEST_TEMPLATE.md

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+### Thank you for making MicroK8s better
+
+Please reference the issue this PR is fixing, or provide a description of the problem addressed.
+
+*Also verify you have:*
+* [ ] Read the [contributions](https://github.com/ubuntu/microk8s/blob/master/CONTRIBUTING.md) page.
+* [ ] Submitted the [CLA form](https://ubuntu.com/legal/contributors/agreement), if you are a first time contributor.

.github/dependabot.yml

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+# Set update schedule for GitHub Actions
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every weekday
+      interval: "daily"

.github/stale.yml

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+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+daysUntilStale: 330
+
+# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+daysUntilClose: 30
+
+# Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
+onlyLabels: []
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - pinned
+  - security
+  - "[Status] Maybe Later"
+
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: false
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: false
+
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: false
+
+# Label to use when marking as stale
+staleLabel: inactive
+
+# Comment to post when marking as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+
+# Comment to post when removing the stale label.
+# unmarkComment: >
+#   Your comment here.
+
+# Comment to post when closing a stale Issue or Pull Request.
+# closeComment: >
+#   Your comment here.
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30
+# Limit to only `issues` or `pulls`
+# only: issues
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+# pulls:
+#   daysUntilStale: 30
+#   markComment: >
+#     This pull request has been automatically marked as stale because it has not had
+#     recent activity. It will be closed if no further activity occurs. Thank you
+#     for your contributions.
+
+# issues:
+#   exemptLabels:
+#     - confirmed

.github/workflows/build-snap.yml

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+name: Build snap on PR and push to master
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Create snap package
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Checking out repo
+        uses: actions/checkout@v2
+      - name: Install lxd
+        run: |
+          sudo lxd init --auto
+          sudo usermod --append --groups lxd $USER
+          sg lxd -c 'lxc version'
+      - name: Install snapcraft
+        run: sudo snap install snapcraft --classic
+      - name: Build snap
+        run: |
+          sg lxd -c 'snapcraft --use-lxd'
+          sudo mv k8s-dqlite*.snap k8s-dqlite.snap
+      - name: Uploading snap
+        uses: actions/upload-artifact@v1
+        with:
+          name: .snap
+          path: k8s-dqlite.snap
+      # TEMPORARY WHILE GITHUB FIXES THIS https://github.com/actions/virtual-environments/issues/3185
+      - name: Add the current IP address, long hostname and short hostname record to /etc/hosts file
+        run: |
+          echo -e "$(ip addr show eth0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)\t$(hostname -f) $(hostname -s)" | sudo tee -a /etc/hosts
+      # DO NOT FORGET TO REMOVE CODE ABOVE WHEN ISSUE IS ADDRESSED!
+      - name: Running test
+        run: |
+          set -x
+          sudo snap install k8s-dqlite.snap --classic --dangerous
+          sudo snap install go --channel 1.16/stable --classic
+          sudo apt install git
+          git clone https://github.com/etcd-io/etcd.git
+          cd etcd
+          git checkout release-3.5
+          cd tools/benchmark
+          go build .
+          ./benchmark --endpoints http://127.0.0.1:12379 range asd
+          sudo snap remove k8s-dqlite --purge