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19 Creating an automated build.md

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Creating an automated build

This is built in yaml, following the instructions at https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions

The file needs to be in .github/workflows, so create build.yaml based on The example dotnet build

Editing the file in Visual Studio Code will find the schema and offer intellisense etc during editing.

I changed the trigger to read

on: push

And pushed to the repo to see what happened. The workflow showed up in the "Actions" tab of the repo on github, and the build failed after 18 seconds.

Making a working build pipeline

The first error was a dumb mistake on the fake command line (I missed the 'build' part of dotnet fake build -f build.fsx -t Build)

(Fix, commit, push, wait for the build)

The next problem was

/home/runner/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : It was not possible to find any compatible framework version [/tmp/1qf2uc4m.onf/WorkerExtensions.csproj]

I suspected this was because that package targets netcoreapp3.1, so I added an extra build step to the yaml to install that version of the .net core sdk.

That was enough to get it building, so I changed the triggers in the yaml file to build on Pull Request or on a Push to the main branch.

The default branch

The example syntax for building the default branch and Pull Requests

on:
  push:
    branches: [ $default-branch ]
  pull_request:
    branches: [ $default-branch ]

didn't seem to work, but it looked likely to be due to the default-branch macro not having been set.

I found that Pulumi could set this with the DefaultBranch property of RepositoryArgs, but that was marked as obsolete. The preferred approach is to use a BranchDefault resource:

    let defaultBranch =
        Pulumi.Github.BranchDefault(
            "EverythingAsCodeFSharpDefaultBranch",
            BranchDefaultArgs(
                Repository = io repo.Name,
                Branch     = input "main"
            )
        )

However, that still didn't work. A StackOverflow answer explains that the [ $default-branch ] is for workflow templates, not the workflows themselves. The macro would be replaced by main for a workflow yaml file.