Adding workflows, dockerfile and submodule.

.github/workflows/docker-build.yaml

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+name: Build
+
+on:
+  push:
+    branches:
+      - '!main'
+  pull_request: { }
+
+jobs:
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Build
+        uses: docker/build-push-action@v1
+        with:
+          registry: containers.monetr.dev
+          repository: twemproxy
+          push: false

.github/workflows/docker-push.yaml

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+name: Publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Generate Tag
+        id: tag
+        run: |
+          echo ::set-output name=POST_TAG::$(date +%Y.%m.%d)
+      - name: Build and push containers.monetr.dev
+        uses: docker/build-push-action@v1
+        with:
+          registry: containers.monetr.dev
+          username: ${{ secrets.containers_push_username }}
+          password: ${{ secrets.containers_push_password }}
+          tags: latest,${{ steps.tag.outputs.POST_TAG }}
+          repository: twemproxy
+      - name: Build and push ghcr.io
+        uses: docker/build-push-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          tags: latest,${{ steps.tag.outputs.POST_TAG }}
+          repository: monetr/twemproxy

.gitmodules

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+[submodule "twemproxy"]
+	path = twemproxy
+	url = https://github.com/twitter/twemproxy.git

Dockerfile

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+FROM gcc:9.4.0
+
+COPY ./twemproxy /usr/src/twemproxy
+WORKDIR /usr/src/twemproxy
+RUN \
+  autoreconf -h && \
+  autoreconf -fvi && \
+  ./configure && \
+  make && \
+  make install
+
+FROM debian:bullseye
+
+COPY --from=builder /usr/local/sbin/nutcracker /bin/nutcracker
+
+ENTRYPOINT [ "nutcracker" ]