Add Dockerfile + build action (#3)

* Add Dockerfile + build action

* Remove 'test' entry that didn't trigger action

.dockerignore

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+.git/
+.vscode/
+build/
+test/
+
+Dockerfile
+README.md

.github/workflows/docker.yaml

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+name: Create and push Docker build image
+on:
+  push:
+    branches: [ main ]
+    tags: [ 'v*.*.*' ]
+
+jobs:
+  public_docker_image:
+    name: Publish Docker image to Github Registry
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/decompals/wibo
+
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Log in to GitHub Docker Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: mkst
+          password: ${{ secrets.GHCR_PAT }}
+
+      - name: Build and push to Github registry (latest)
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ghcr.io/ghcr.io/decompals/wibo:latest
+        if: ${{ ! startsWith(github.ref, 'refs/tags/v') }}
+
+      - name: Build and push to Github registry (versioned)
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+        if: ${{ startsWith(github.ref, 'refs/tags/v') }}

Dockerfile

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+FROM ubuntu:22.04 as build
+
+RUN apt-get update && apt-get install -y --no-install-recommends g++ g++-multilib make
+
+COPY . /WiBo
+
+RUN make -C /WiBo
+
+
+FROM ubuntu:22.04
+
+RUN dpkg --add-architecture i386 \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends libstdc++6:i386
+
+COPY --from=build /WiBo/wibo /usr/local/sbin/wibo
+
+CMD /usr/local/sbin/wibo