Add github action to publish docker image

.dockerignore

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+### C
+# Object files
+*.o
+
+# Libraries
+*.a
+*.la
+*.lo
+
+# Build directories
+build/
+debug/
+release/
+
+# Executables
+*.out
+### End of C
+
+### Python
+# Byte-compiled / optimized
+__pycache__/
+*.py[cod]
+
+# Unit test
+.pytest_cache/
+### End of Python
+
+### VIM
+# Temporary files
+*~
+tmp
+tmp-*
+
+# Swap
+.*.swp
+.*.swo
+
+# Backup
+*.bak
+
+# Auto-generated tag files
+tags
+TAGS
+### End of VIM
+
+### Distribution
+vips-*.tar.gz
+### End of Distribution

.github/workflows/docker.yml

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+name: Docker
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+    tags:
+      - 'v*'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  Publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Login to Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+WORKDIR /libvips
+COPY ./ /libvips
+
+RUN \
+  # Install dependencies
+  apt-get update && \
+  apt-get install -y \
+  automake build-essential libgirepository1.0-dev \
+  ninja-build python3 python3-pip python3-setuptools python3-wheel \
+  gobject-introspection libglib2.0-dev libpng-dev \
+  libjpeg-turbo8-dev libwebp-dev libtiff5-dev libgif-dev \
+  libexif-dev libxml2-dev libpoppler-glib-dev swig \
+  libpango1.0-dev libmatio-dev libopenslide-dev libcfitsio-dev \
+  libgsf-1-dev fftw3-dev liborc-0.4-dev librsvg2-dev libimagequant-dev && \
+  #
+  # Install meson from pip since the one in apt repository is outdated
+  pip3 install meson && \
+  #
+  # Build and install
+  meson build --libdir=lib && \
+  cd build && meson compile && meson install && \
+  #
+  # Cleanup
+  cd / && rm -rf /libvips && \
+  pip3 uninstall -y meson && \
+  # TODO: should we keep these?
+  apt-get remove -y automake build-essential ninja-build \
+  python3-pip python3-setuptools python3-wheel && \
+  apt-get autoremove -y && \
+  apt-get autoclean && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+WORKDIR /data