Added a Dockerfile for building docker images (#101)

.dockerignore

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+dist
+node_modules

docker/Dockerfile

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+FROM node:21.6.1 AS build
+
+# Create a directory for the build and populate it with repo
+COPY ./ /opt/curl-build/
+
+WORKDIR /opt
+
+# Install the prerequisites for the project
+RUN echo "## Update and install packages" && \
+    apt-get -qq -y update && \
+    apt-get -qq install -y --no-install-recommends \
+        binutils \
+        build-essential \
+        ca-certificates \
+        file \
+        git \
+        python3 \
+        python3-pip && \
+    echo "## Done"
+
+# Install EMSDK
+RUN echo "## Build and install EMSDK" && \
+    git clone https://github.com/emscripten-core/emsdk.git && \
+    cd emsdk && \
+    bash emsdk install latest && \
+    bash emsdk activate latest && \
+    echo "## Done"
+
+# Build curlconverter.github.io distribution
+RUN echo "## Build curlconverter.gitub.io" && \
+    cd /opt/emsdk && \
+    . /opt/emsdk/emsdk_env.sh && \
+    cd /opt/curl-build && \
+    npm install && \
+    npm run build && \
+    echo "## Done"
+
+
+# Create a new image from the build containing just the web content
+FROM nginx:latest
+COPY --from=build /opt/curl-build/dist /usr/share/nginx/html
+
+
+LABEL maintainer="contact@lemonlemmings.co.uk" \
+      org.label-schema.name="curlconverter.github.io" \
+      org.label-schema.description="A container containing the curlconverter.github.io demonstration web app" \
+      org.label-schema.url="https://curlconverter.com" \
+      org.label-schema.vcs-url="https://github.com/curlconverter/curlconverter.github.io" \
+      org.label-schema.docker.dockerfile="/docker/Dockerfile"

docker/README.md

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+To run build locally from the root of the repository run:
+
+```bash
+docker build -f ./docker/Dockerfile -t curlconverter.github.io-nginx .
+```