Update cheatsheets

tldr/pulumi-stack

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pulumi stack
+
+> Manage stacks and view stack state.
+> More information: <https://www.pulumi.com/docs/iac/cli/commands/pulumi_stack/>.
+
+- Create a new stack:
+
+`pulumi stack init {{stack_name}}`
+
+- View the stack state:
+
+`pulumi stack`
+
+- List known stacks:
+
+`pulumi stack ls`
+
+- Select an active stack:
+
+`pulumi stack select {{stack_name}}`
+
+- Show stack outputs, including secrets, in plaintext:
+
+`pulumi stack output --show-secrets`
+
+- Export the stack state to a JSON file:
+
+`pulumi stack export --file {{path/to/file.json}}`
+
+- Display help:
+
+`pulumi stack --help`