Add basic Dockerfile to build image

.dockerignore

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+**/appsettings.Development.json

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:8.0 as builder
+
+COPY . /ModShark
+WORKDIR /ModShark
+
+RUN dotnet publish ModShark.sln
+
+
+FROM mcr.microsoft.com/dotnet/runtime:8.0
+
+# Install jq and use Docker caching for package downloads
+ENV DEBIAN_FRONTEND=noninteractive
+RUN --mount=target=/var/lib/apt/lists,type=cache,sharing=locked \
+    --mount=target=/var/cache/apt,type=cache,sharing=locked \
+    rm -rf /etc/apt/apt.conf.d/docker-clean && \
+    apt-get update && apt-get install -y jq
+
+# Add modshark user and copy built modshark
+RUN useradd -m -s /bin/bash modshark
+COPY --from=builder --chown=modshark:modshark /ModShark/ModShark/bin/Release/net8.0/publish/ /ModShark
+COPY --from=builder --chown=modshark:modshark /ModShark/SharkeyDB/bin/Release/net8.0/publish/ /SharkeyDB
+COPY --from=builder --chown=modshark:modshark /ModShark/entrypoint.sh /entrypoint.sh
+
+USER modshark
+WORKDIR /ModShark
+
+# Start ModShark at container startup
+ENTRYPOINT [ "/entrypoint.sh" ]
+CMD [ "dotnet", "/ModShark/ModShark.dll" ]

entrypoint.sh

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+#!/bin/bash
+if [[ $# > 0 ]]; then
+    tmpfile=$(mktemp)
+    vars=()
+    while IFS='=' read -r -d '' n v; do
+        if [[ $n == "MODSHARK__"* ]]; then
+            vars+=("$(printf "%s=%s" "$n" "$v")")
+        fi
+    done < <(env -0)
+
+    for var in "${vars[@]}"; do 
+        item=$(echo "${var}" | grep  ^MODSHARK__ | sed s/^MODSHARK__/./g | sed s/__/./g)
+        key=$(echo "${item}" | cut -d "=" -f 1)
+        value=$(echo "${item}" | cut -d "=" -f 2-)
+        jq $key="\"$value\"" appsettings.json > $tmpfile && \
+        mv $tmpfile appsettings.json
+    done
+    exec $@
+else
+    /bin/bash
+fi