Deploy docs from main to ghpages

I suggest that the example be updated to deploy from main rather than master. I tried replacing master with main in the ci.yml branches: [main] But then it doesn't deploy to gh-pages.

Info: Deployment criteria for deploying devbranch build from GitHub Actions:
│ - ✔ ENV["GITHUB_REPOSITORY"]="PsuAstro528/project-template" occurs in repo="github.com/PsuAstro528/project-template.git"
│ - ✔ ENV["GITHUB_EVENT_NAME"]="push" is "push"
│ - ✘ ENV["GITHUB_REF"] matches devbranch="master"
│ - ✔ ENV["GITHUB_ACTOR"] exists
│ - ✔ ENV["DOCUMENTER_KEY"] exists
└ Deploying: ✘

Then I tried adding devbranch to docs/make.jl deploydocs(repo = "github.com/PsuAstro528/project-template.git", devbranch="main") but then I got

hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint: 
hint:   git config --global init.defaultBranch <name>
hint: 
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint: 
hint:   git branch -m <name>
Initialized empty Git repository in /tmp/jl_f1Y7Hk/.git/
Load key "/home/runner/work/project-template/project-template/docs/.documenter": error in libcrypto
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
┌ Error: Git failed to fetch git@github.com:PsuAstro528/project-template.git
│ This can be caused by a DOCUMENTER_KEY variable that is not correctly set up.
│ Make sure that the environment variable is properly set up as a Base64-encoded string
│ of the SSH private key. You may need to re-generate the keys with DocumenterTools.
└ @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:552
┌ Error: Failed to push:
│   exception =
│    failed process: Process(`git fetch upstream`, ProcessExited(128)) [128]
│    
│    Stacktrace:
│      [1] pipeline_error
│        @ ./process.jl:565 [inlined]
│      [2] run(::Cmd; wait::Bool)
│        @ Base ./process.jl:480
│      [3] run
│        @ ./process.jl:477 [inlined]
│      [4] (::Documenter.var"#git_commands#27"{String, String, SubString{String}, String, Vector{Any}, Bool, String, String})(sshconfig::String)
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:550
│      [5] (::Documenter.var"#26#32"{String})()
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:655
│      [6] cd(f::Documenter.var"#26#32"{String}, dir::String)
│        @ Base.Filesystem ./file.jl:112
│      [7] #25
│        @ ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:655 [inlined]
│      [8] withenv(f::Documenter.var"#25#31"{String, String}, keyvals::Pair{String, String})
│        @ Base ./env.jl:197
│      [9] (::Documenter.var"#24#30"{String, String, SubString{String}, String})(sshconfig::String, io::IOStream)
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:654
│     [10] mktemp(fn::Documenter.var"#24#30"{String, String, SubString{String}, String}, parent::String)
│        @ Base.Filesystem ./file.jl:732
│     [11] mktemp(fn::Function)
│        @ Base.Filesystem ./file.jl:730
│     [12] git_push(root::String, temp::String, repo::String; branch::String, dirname::String, target::String, sha::SubString{String}, devurl::String, versions::Vector{Any}, forcepush::Bool, deploy_config::Documenter.GitHubActions, subfolder::String, is_preview::Bool)
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:639
│     [13] git_push
│        @ ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:526 [inlined]
│     [14] #18
│        @ ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:504 [inlined]
│     [15] mktempdir(fn::Documenter.var"#18#20"{SubString{String}, String, String, String, String, Vector{Any}, Bool, Documenter.GitHubActions, Bool, String, String, String}, parent::String; prefix::String)
│        @ Base.Filesystem ./file.jl:760
│     [16] mktempdir(fn::Function, parent::String)
│        @ Base.Filesystem ./file.jl:756
│     [17] mktempdir
│        @ ./file.jl:756 [inlined]
│     [18] (::Documenter.var"#17#19"{String, String, String, Nothing, String, Vector{Any}, Bool, Documenter.GitHubActions, Bool, String, String, String})()
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:503
│     [19] cd(f::Documenter.var"#17#19"{String, String, String, Nothing, String, Vector{Any}, Bool, Documenter.GitHubActions, Bool, String, String, String}, dir::String)
│        @ Base.Filesystem ./file.jl:112
│     [20] deploydocs(; root::String, target::String, dirname::String, repo::String, branch::String, repo_previews::String, branch_previews::String, deps::Nothing, make::Nothing, devbranch::String, devurl::String, versions::Vector{Any}, forcepush::Bool, deploy_config::Documenter.GitHubActions, push_preview::Bool)
│        @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:480
│     [21] top-level scope
│        @ ~/work/project-template/project-template/docs/make.jl:5
│     [22] include(mod::Module, _path::String)
│        @ Base ./Base.jl:[45](https://github.com/PsuAstro528/project-template/actions/runs/5902823903/job/16011550982#step:5:46)7
│     [23] exec_options(opts::Base.JLOptions)
│        @ Base ./client.jl:307
│     [24] _start()
│        @ Base ./client.jl:[52](https://github.com/PsuAstro528/project-template/actions/runs/5902823903/job/16011550982#step:5:53)2
└ @ Documenter ~/.julia/packages/Documenter/6vUwN/src/Documenter.jl:6[60](https://github.com/PsuAstro528/project-template/actions/runs/5902823903/job/16011550982#step:5:61)

At that point, I gave up.
I'm probably missing something basic, but it's not obvious how to solve this from either example or the documentation. Thanks.

JuliaLang / Example.jl

Deploy docs from main to ghpages #76