Add workflow to build SimpleX Server Container images

.github/Dockerfile.simplex

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+ARG TAG=22.04
+
+FROM ubuntu:${TAG} AS build
+
+### Build stage
+
+# Install curl and git and simplexmq dependencies
+RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev llvm-12 llvm-12-dev libnuma-dev libssl-dev
+
+# Specify bootstrap Haskell versions
+ENV BOOTSTRAP_HASKELL_GHC_VERSION=9.6.3
+ENV BOOTSTRAP_HASKELL_CABAL_VERSION=3.10.1.0
+
+# Install ghcup
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
+
+# Adjust PATH
+ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
+
+# Set both as default
+RUN ghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}" && \
+    ghcup set cabal "${BOOTSTRAP_HASKELL_CABAL_VERSION}"
+
+COPY . /project
+WORKDIR /project
+
+# Compile apps
+RUN cabal update
+RUN cabal build exe:smp-server
+RUN cabal build exe:xftp-server
+
+# Create new path containing all files needed
+RUN mkdir /final
+WORKDIR /final
+
+# Strip the binaries from debug symbols to reduce size
+RUN for app in smp-server xftp-server; do \
+    bin=$(find /project/dist-newstyle -name "$app" -type f -executable) && \
+    mv "$bin" ./ && \
+    strip ./"$app" &&\
+    mv /project/scripts/docker/entrypoint-"$app" ./entrypoint; \
+done
+
+### Final stage
+FROM ubuntu:${TAG}
+
+# Install OpenSSL dependency
+RUN apt-get update \
+  && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends openssl libnuma-dev netcat \
+  && rm -rf /var/lib/apt/lists/*
+
+# Copy compiled apps from build stage
+COPY --from=build /final /usr/local/bin/
+
+# simplexmq requires using SIGINT to correctly preserve undelivered messages and restore them on restart
+STOPSIGNAL SIGINT

.github/workflows/build-simplex-server.yml

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+name: Build and Publish SimpleX Docker Image
+
+on:
+  workflow_dispatch:
+    inputs:
+      simplex_version:
+        description: 'SimpleX Server version to build (e.g. v6.0.4 or v6.1.0-beta.1). Use "latest" to build the most recent version'
+        required: true
+        default: 'latest'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    env:
+      REPO_URL: https://github.com/simplex-chat/simplex-chat.git
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+      with:
+        install: true
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Fetch latest tags from SimpleX repository
+      run: |
+        git clone --depth=1 --tags $REPO_URL
+        cd simplex-chat
+        # Find the latest tag, filtering out any non-version tags like 'v*'
+        LATEST_TAG=$(git tag -l --sort=-v:refname 'v*' | head -n 1)
+        echo "Latest tag found: $LATEST_TAG"
+        echo "LATEST_TAG=$LATEST_TAG" >> $GITHUB_ENV
+
+    - name: Determine version to build
+      run: |
+        if [ "${{ github.event.inputs.simplex_version }}" == "latest" ]; then
+          echo "Using latest tag: $LATEST_TAG"
+          echo "SIMPLEX_VERSION=$LATEST_TAG" >> $GITHUB_ENV
+        else
+          echo "Using specified version: ${{ github.event.inputs.simplex_version }}"
+          echo "SIMPLEX_VERSION=${{ github.event.inputs.simplex_version }}" >> $GITHUB_ENV
+
+    - name: Build and push Docker image for x86 and arm
+      run: |
+        echo "Building SimpleX version: $SIMPLEX_VERSION"
+
+        docker buildx build \
+          --platform linux/amd64,linux/arm64 \
+          --file .github/Dockerfile.simplex \
+          --tag ghcr.io/${{ github.repository_owner }}/${{ github.repository }}:$SIMPLEX_VERSION \
+          --build-arg SIMPLEX_VERSION=$SIMPLEX_VERSION \
+          --push \
+          .
+
+    - name: Image build complete
+      run: echo "Docker image has been built and published."