Add container and CI

.github/workflows/ci.yml

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+name: instances.invidio.us CI
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+    branches: "*"
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Crystal
+        uses: oprypin/install-crystal@v1.3.0
+
+      - name: Cache Shards
+        uses: actions/cache@v2
+        with:
+          path: ./lib
+          key: shards-${{ hashFiles('shard.lock') }}
+
+      - name: Install Shards
+        run: |
+          if ! shards check; then
+            shards install
+          fi
+
+      - name: Run lint
+        run: |
+          if ! crystal tool format --check; then
+            crystal tool format
+            git diff
+            exit 1
+          fi
+
+      - name: Build
+        run: crystal build --warnings all --error-on-warnings --error-trace src/instances.cr
+
+  build-docker:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build Docker
+        run: docker-compose up -d
+
+      - name: Test Docker
+        run: while curl -Isf http://localhost:3000; do sleep 1; done

Dockerfile

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+FROM crystallang/crystal:0.35.1-alpine AS builder
+WORKDIR /app
+COPY ./shard.yml ./shard.yml
+RUN shards install
+COPY ./src/ ./src/
+RUN crystal build ./src/instances.cr --release
+
+FROM alpine:latest
+RUN apk add --no-cache gc pcre libgcc
+WORKDIR /app
+RUN addgroup -g 1000 -S invidious && \
+    adduser -u 1000 -S invidious -G invidious
+COPY ./assets/ ./assets/
+COPY --from=builder /app/instances .
+
+EXPOSE 3000
+USER invidious
+CMD ["/app/instances"]

docker-compose.yml

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+version: '3'
+services:
+  instances:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3000:3000"