Add Dockerfile for mimc-fast build

.github/workflows/build-docker-image.yml

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+name: build-docker-image
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: alextes/mimc-fast:latest
+      -
+        name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

Dockerfile

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+FROM rust
+WORKDIR /darkforest-rs
+
+COPY . .
+RUN cargo build --release --bin mimc-fast
+
+EXPOSE 8000
+CMD ["./target/release/mimc-fast"]