Build docker image in gh actions

.github/FUNDING.yml

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+github: owickstrom

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+This issue tracker is **ONLY** used for reporting bugs. 
+
+Feature requests, questions, and other discussions should be posted in the
+[Discussions](https://github.com/quickstrom/quickstrom/discussions) forum.
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen. Include
+screenshots, logs or stack traces if applicable.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Ubuntu 18.04, macOS 10.10]
+ - Quickstrom version or commit [e.g. 0.1.0]
+ - Browser and webdriver information: [e.g. Firefox 86.0 and Geckodriver 0.29.1]
+ - Build environment or installation method [e.g. Nix, Cabal, Docker]
+
+**Additional context**
+Add any other context about the problem here.

.github/workflows/test.yml

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+name: "Build and test"
+on:
+  pull_request:
+  push:
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          experimental-features = nix-command
+    - uses: cachix/cachix-action@v8
+      with:
+        name: quickstrom
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: nix show-config
+    - run: nix-env -f '<nixpkgs>' -i nix-build-uncached
+    - run: |
+        version=$(nix-shell -p yj --command "yj -tj < pyproject.toml | jq -r '.tool.poetry.version'")
+        echo "version=$version" >> $GITHUB_ENV
+        echo "Version: $version"
+    - run: nix-build-uncached default.nix
+
+  integration-tests:
+    needs: build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        browser: 
+          - chrome
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          experimental-features = nix-command
+    - uses: cachix/cachix-action@v8
+      with:
+        name: quickstrom
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: nix show-config
+    - run: nix-env -f '<nixpkgs>' -i nix-build-uncached
+    - run: nix build -L -j1 --option sandbox relaxed --argstr browser ${{matrix.browser}} -f integration-tests/default.nix
+
+  build-docker:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          experimental-features = nix-command
+    - uses: cachix/cachix-action@v8
+      with:
+        name: quickstrom
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: docker login --username botstrom --password "$DOCKER_HUB_ACCESS_TOKEN"
+      if: github.ref == 'refs/heads/main'
+      env:
+        DOCKER_HUB_ACCESS_TOKEN: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+    - run: docker load -i $(nix-build -A docker default.nix)
+    - run: |
+        docker tag quickstrom/quickstrom:latest quickstrom/quickstrom:${{ env.version }}
+        docker push quickstrom/quickstrom:latest
+        docker push quickstrom/quickstrom:${{ env.version }}
+      if: github.ref == 'refs/heads/main'
+
+  lint-docs:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.3.1
+    - uses: cachix/install-nix-action@v12
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          experimental-features = nix-command
+    - uses: cachix/cachix-action@v8
+      with:
+        name: quickstrom
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+    - run: nix-build docs/default.nix