Adds docker instalation.

install_docker.sh

+#-----------------------------------------------------------------------
+# Documentação oficial.
+# https://docs.docker.com/engine/install/ubuntu/
+
+#--------------------------------------------
+# Remove versões antigas do docker.
+
+sudo apt-get remove docker
+sudo apt-get remove docker-engine
+sudo apt-get remove docker.io
+sudo apt-get remove containerd runc
+sudo apt-get remove runc
+sudo apt autoremove
+
+#--------------------------------------------
+#
+
+# Atualiza o index.
+sudo apt-get update
+
+# Permite https.
+sudo apt-get install \
+    ca-certificates \
+    curl \
+    gnupg \
+    lsb-release
+
+# Adiciona chave GPG oficial.
+sudo mkdir -p /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+
+# Configura o repositório.
+echo \
+    "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
+    $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+# Atualiza o index.
+sudo apt-get update
+
+#--------------------------------------------
+# Instala.
+
+sudo apt-get install \
+    docker-ce \
+    docker-ce-cli \
+    containerd.io \
+    docker-compose-plugin
+
+#--------------------------------------------
+# Roda exemplo de teste.
+
+sudo docker run hello-world
+
+#--------------------------------------------
+# Cheat sheet.
+# https://www.interviewbit.com/docker-cheat-sheet/
+
+# Lista containers ativos.
+sudo docker container ls -a
+
+# Lista imagens.
+sudo docker image ls
+
+#-----------------------------------------------------------------------