Initial attempt at GH Actions

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yaml

@@ -0,0 +1,101 @@
+name: CI
+
+"on":
+  merge_group: {}
+  pull_request: {}
+  push:
+    branches-ignore:
+      # These should always correspond to pull requests, so ignore them for
+      # the push trigger and let them be triggered by the pull_request
+      # trigger, avoiding running the workflow twice.  This is a minor
+      # optimization so there's no need to ensure this is comprehensive.
+      - "dependabot/**"
+      - "renovate/**"
+      - "tickets/**"
+      - "u/**"
+    tags:
+      - "*"
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.7"
+
+      - name: Run pre-commit
+        uses: pre-commit/[email protected]
+
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        python:
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run tox
+        uses: lsst-sqre/run-tox@v1
+        with:
+          python-version: ${{ matrix.python }}
+          tox-envs: "py,coverage-report,typing"
+
+  build:
+    runs-on: ubuntu-latest
+    needs: [lint, test]
+    timeout-minutes: 15
+
+    # Only do Docker builds of tagged releases and pull requests from ticket
+    # branches.  This will still trigger on pull requests from untrusted
+    # repositories whose branch names match our tickets/* branch convention,
+    # but in this case the build will fail with an error since the secret
+    # won't be set.
+    if: >
+      startsWith(github.ref, 'refs/tags/')
+      || startsWith(github.head_ref, 'tickets/')
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Define the Docker tag
+        id: vars
+        run: echo ::set-output name=tag::$(scripts/docker-tag.sh)
+
+      - name: Print the tag
+        id: print
+        run: echo ${{ steps.vars.outputs.tag }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/lsst-sqre/giftless-github-proxy-auth:${{ steps.vars.outputs.tag }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max