Add dockerfile && docker image actions

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: build
+on: [push]
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          platforms: linux/amd64
+          context: .
+          push: true
+          tags: ghcr.io/bluegroundltd/librdkafka:latest

Dockerfile

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+FROM --platform=linux/amd64 debian:bullseye-slim AS rdkafka-builder
+RUN apt-get update && apt-get install -yqq \
+    build-essential \
+    git \
+    libcurl4-openssl-dev \
+    liblz4-dev \
+    libsasl2-dev \
+    libssl-dev \
+    libtool-bin \
+    libxml2-dev \
+    libzstd-dev \
+    pkg-config \
+    python3 \
+    rapidjson-dev \
+    zlib1g-dev
+
+# linking the libxml library where the librdkafka build script expects it
+RUN ln -sf /usr/lib/x86_64-linux-gnu/pkgconfig/libxml-2.0.pc /usr/lib/x86_64-linux-gnu/pkgconfig/libxml2.pc
+
+COPY . .
+
+RUN ./configure && \
+    make && \
+    make install