docker: add Dockerfile, update Vagrantfile to add Docker provider

also update VM to Debian 12 Bookworm (was Debian 10 Buster)

Vagrantfile

@@ -4,8 +4,7 @@
 VAGRANT_CONFIG_VERSION = "2"
 
 Vagrant.configure(VAGRANT_CONFIG_VERSION) do |config|
-  # Using the "contrib" version for vboxsf module for synced folders
-  config.vm.box = "debian/contrib-buster64"
+  config.vm.box = "debian/bookworm64"
 
   # Main application folder
   config.vm.synced_folder "tildes/", "/opt/tildes/"
@@ -16,18 +15,11 @@ Vagrant.configure(VAGRANT_CONFIG_VERSION) do |config|
   config.vm.network "forwarded_port", guest: 9090, host: 9090
 
   config.vm.provision "ansible_local" do |ansible|
+    ansible.install = true
     ansible.install_mode = "pip"
-
-    # Since Debian Buster still uses Python 2.7 by default and the pip bootstrap
-    # script is no longer compatible with 2.7, we need to specify the installation
-    # command manually. If we upgrade to a newer version of Debian that defaults to
-    # Python 3.6+, this should no longer be necessary.
-    ansible.pip_install_cmd = "sudo apt-get install -y python3-distutils && curl -s https://bootstrap.pypa.io/get-pip.py | sudo python3"
-
-    # Vagrant doesn't currently recognize the new format for Ansible versions
-    # (e.g. "ansible [core 2.11.1]"), so the compatibility mode is set incorrectly.
-    # A new version of Vagrant should resolve this soon.
-    ansible.compatibility_mode = "2.0"
+    ansible.version = "10.6.0"
+    ansible.pip_install_cmd = "sudo apt-get install -y python3-pip"
+    ansible.pip_args = "--break-system-packages"
 
     # put the VM into the "dev" and "app_server" Ansible groups
     ansible.groups = {
@@ -43,4 +35,19 @@ Vagrant.configure(VAGRANT_CONFIG_VERSION) do |config|
       vb.memory = "4096"
       vb.cpus = "4"
   end
+
+  config.vm.provider "docker" do |d, override|
+    # Docker does not require config.vm.box
+    override.vm.box = nil
+    # Instead, specify build_dir where Dockerfile is located.
+    d.build_dir = "./docker"
+    d.dockerfile = "Dockerfile-for-vagrant"
+
+    # Keep Docker container running indefinitely
+    d.remains_running = true
+    d.create_args = ["--detach", "--tty"]
+
+    # SSH configuration
+    d.has_ssh = true
+  end
 end

docker/Dockerfile-for-vagrant

@@ -0,0 +1,33 @@
+FROM debian:12
+ENV container docker
+
+RUN useradd --create-home vagrant \
+  && echo "vagrant:vagrant" | chpasswd \
+  && groupadd wheel \
+  && usermod -a -G wheel vagrant
+
+# allow vagrant to login
+RUN cd ~vagrant \
+  && mkdir .ssh \
+  && echo "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key" > .ssh/authorized_keys \
+  && chown -R vagrant:vagrant .ssh \
+  && chmod 0700 .ssh \
+  && chmod 0600 .ssh/authorized_keys
+
+EXPOSE 22
+
+# install sudo, sshd, git, python3
+RUN apt-get update && apt-get install -y sudo openssh-server git python3
+
+# Enable passwordless sudo for the "vagrant" user
+RUN mkdir -p /etc/sudoers.d
+RUN install -b -m 0440 /dev/null /etc/sudoers.d/vagrant
+RUN echo 'vagrant ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers.d/vagrant
+
+# Use systemd replacement script to simulate systemd in Docker
+# https://github.com/gdraheim/docker-systemctl-replacement
+COPY systemctl3.py /usr/bin/systemctl
+RUN test -e /bin/systemctl || ln -sf /usr/bin/systemctl /bin/systemctl
+RUN chmod 0755 /usr/bin/systemctl
+RUN systemctl enable ssh
+CMD ["/usr/bin/systemctl"]