Create install-packer.md

docs/install-packer.md

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+# Install Hashicorp Packer on Ubuntu 22.04
+
+```
+# Add Hashicorp's official GPG key
+sudo apt-get update
+sudo apt-get install ca-certificates curl gnupg
+sudo install -m 0755 -d /etc/apt/keyrings
+curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/hashicorp.gpg
+sudo chmod a+r /etc/apt/keyrings/hashicorp.gpg
+
+# Add the repository to Apt sources
+echo \
+  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/hashicorp.gpg] https://apt.releases.hashicorp.com \
+  "$(. /etc/os-release && echo "$VERSION_CODENAME")" main" | \
+  sudo tee /etc/apt/sources.list.d/hashicorp.list > /dev/null
+sudo apt-get update
+
+# To install the latest version
+sudo apt install packer
+
+# Verify the install
+$ packer version
+Packer v1.9.4
+```