The correct GitHub Actions context property for the short branch or tag name that triggered the workflow is github.ref_name. A job-level if: condition can use this context to control whether the job runs. Therefore, if: github.ref_name == ' feature-branch ' correctly limits the deploy job to the feature-branch branch. The other options use invalid context paths such as github.ref.name, github.branch_name, and github.branch.name; these are not recognized GitHub Actions properties. In exam terms, this question validates knowledge of workflow expressions, GitHub context variables, and conditional job execution. The important distinction is that github.ref contains the full ref path, while github.ref_name provides the branch or tag name directly.

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The runs-on keyword allows you to specify the operating system and other labels for the runner. By specifying self-hosted, windows, and x64, you are targeting a self-hosted Windows runner that matches these criteria, which aligns with the custom configuration of your self-hosted runner.

A workflow can be triggered by multiple events either by using array syntax, such as on: [push, pull_request], or by configuring each event separately when filters or activity types are needed. Option C is valid because both push and pull_request are supported workflow events. Option E is also valid because it configures two event triggers: push filtered to the main branch and release filtered to the created activity type. Option B is invalid because commit is not a GitHub Actions workflow event. Option A wrongly puts environments under on. Option D defines branch filters without an event. Option F uses initiate, which is not a valid event. GitHub documents both multiple-event array syntax and separate event configuration for filters.

Caching is ideal for files that change rarely, such as dependencies or build outputs, as it speeds up subsequent workflow runs by reusing previously cached files instead of re-downloading or rebuilding them.

Artifacts are used for persisting files produced during a job that need to be used in later jobs or after the workflow has ended, allowing them to be downloaded or referenced later.

A TypeScript-based GitHub Action is implemented as a JavaScript action because TypeScript is compiled or bundled into JavaScript before execution by the GitHub Actions runner. JavaScript actions use an action.yml metadata file whose runs.using value specifies a supported Node.js runtime and whose runs.main property identifies the generated JavaScript entry point, commonly a file under dist. This approach allows the action to run directly on supported Linux, Windows, and macOS runners without requiring a separate Docker container. A composite action is intended primarily to combine reusable workflow steps, while a Bash script action is not a distinct metadata action type. Docker container actions are appropriate when a packaged container environment is specifically required. Therefore, a custom action authored in TypeScript should be packaged and distributed as a JavaScript action.

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GitHub Actions uses the special GITHUB_OUTPUT environment file to define output parameters for a workflow step. The required format is name=value, appended to the file. Therefore, writing action_color=purple to $GITHUB_OUTPUT correctly creates an output named action_color. The step should also have an id if another step needs to reference the value through the steps. < id > .outputs context. GITHUB_ENV serves a different purpose: it creates environment variables for subsequent steps in the same job. The add-mask workflow command masks sensitive values in logs, while debug writes diagnostic information. Neither defines an output parameter. GitHub ' s current workflow-command documentation explicitly identifies GITHUB_OUTPUT as the supported environment file for setting step outputs.

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For a run step in a composite action, GitHub Actions supports the working-directory property to specify the directory in which the command executes. The property belongs to the individual step, alongside properties such as run and shell. The generic keyword directory is not part of GitHub Actions metadata syntax. Composite actions declare runs.using: composite, after which runs.steps defines the reusable sequence of commands or actions. An input such as inputs.dir can therefore be referenced through an expression and assigned to working-directory. GitHub ' s action metadata reference explicitly defines runs.steps[*].working-directory as the supported property for controlling the execution directory of a composite-action command. Therefore, option B is the valid implementation.

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GitHub secrets are defined at different levels: organization, repository, and sometimes at the workflow level. If a secret is defined at both the organization level and the repository level, the repository-level secret will take precedence. So, if the value of the secret differs between these levels, the workflow will use the value from the repository level instead of the organization level.

Actions stored in private repositories within the organization can be reused across all repositories by referencing them in workflows. This ensures a centralized way of maintaining custom actions.

Encrypted secrets can be accessed across repositories in the same organization, making it easy to store sensitive data (like API keys or tokens) securely while allowing multiple workflows to access them.

Workflow templates allow you to create reusable templates for workflows that can be shared across repositories within the organization. This makes it easier to standardize processes and automate them across multiple projects.

GitHub Actions provides the debug workflow command for writing debug-level messages to the workflow log. The command syntax is ::debug::{message}, so option B correctly sends the message to the runner through standard output. To make these debug messages visible in workflow logs, step debug logging must also be enabled using ACTIONS_STEP_DEBUG=true. Option A refers to a nonexistent $DEBUG_MESSAGE environment file. Option C uses add-mask, which instructs GitHub to redact a value from logs rather than print diagnostic information. Option D writes a value to GITHUB_OUTPUT, which creates a step output instead of a debug message. GitHub documents the Bash syntax with echo " ::debug::message " , making option B the supported workflow-command format.

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