Added dev container (h2non#385)

* Added dev container

* Removed irrelevant lines

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.217.4/containers/go/.devcontainer/base.Dockerfile
+
+# [Choice] Go version (use -bullseye variants on local arm64/Apple Silicon): 1, 1.16, 1.17, 1-bullseye, 1.16-bullseye, 1.17-bullseye, 1-buster, 1.16-buster, 1.17-buster
+ARG VARIANT="1.17-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/go:0-${VARIANT}
+
+# Versions of libvips and golanci-lint
+ARG LIBVIPS_VERSION=8.12.2
+ARG GOLANGCILINT_VERSION=1.29.0
+
+# Install additional OS packages
+RUN DEBIAN_FRONTEND=noninteractive \
+  apt-get update && \
+  apt-get install --no-install-recommends -y \
+  ca-certificates \
+  automake build-essential curl \
+  procps    libopenexr25 libmagickwand-6.q16-6 libpango1.0-0 libmatio11 \
+  libopenslide0 libjemalloc2 gobject-introspection gtk-doc-tools \
+  libglib2.0-0 libglib2.0-dev libjpeg62-turbo libjpeg62-turbo-dev \
+  libpng16-16 libpng-dev libwebp6 libwebpmux3 libwebpdemux2 libwebp-dev \
+  libtiff5 libtiff5-dev libgif7 libgif-dev libexif12 libexif-dev \
+  libxml2 libxml2-dev libpoppler-glib8 libpoppler-glib-dev \
+  swig libmagickwand-dev libpango1.0-dev libmatio-dev libopenslide-dev \
+  libcfitsio9 libcfitsio-dev libgsf-1-114 libgsf-1-dev fftw3 fftw3-dev \
+  liborc-0.4-0 liborc-0.4-dev librsvg2-2 librsvg2-dev libimagequant0 \
+  libimagequant-dev libheif1 libheif-dev && \
+  cd /tmp && \
+  curl -fsSLO https://github.com/libvips/libvips/releases/download/v${LIBVIPS_VERSION}/vips-${LIBVIPS_VERSION}.tar.gz && \
+  tar zvxf vips-${LIBVIPS_VERSION}.tar.gz && \
+  cd /tmp/vips-${LIBVIPS_VERSION} && \
+	CFLAGS="-g -O3" CXXFLAGS="-D_GLIBCXX_USE_CXX11_ABI=0 -g -O3" \
+    ./configure \
+    --disable-debug \
+    --disable-dependency-tracking \
+    --disable-introspection \
+    --disable-static \
+    --enable-gtk-doc-html=no \
+    --enable-gtk-doc=no \
+    --enable-pyvips8=no && \
+  make && \
+  make install && \
+  ldconfig
+
+# Installing golangci-lint
+RUN curl -fsSL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b "${GOPATH}/bin" v${GOLANGCILINT_VERSION}
+
+# [Optional] Uncomment the next lines to use go get to install anything else you need
+# USER vscode
+# RUN go get -x <your-dependency-or-tool>

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.217.4/containers/go
+{
+	"name": "Go",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			// Update the VARIANT arg to pick a version of Go: 1, 1.16, 1.17
+			// Append -bullseye or -buster to pin to an OS version.
+			// Use -bullseye variants on local arm64/Apple Silicon.
+			"VARIANT": "1.17-bullseye"
+		}
+	},
+	"runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"go.toolsManagement.checkForUpdates": "local",
+		"go.useLanguageServer": true,
+		"go.gopath": "/go",
+		"go.goroot": "/usr/local/go"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"golang.Go"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [9000],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "go version",
+
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode",
+	"features": {
+		"docker-from-docker": "latest"
+	}
+}