Add localregistry input option (#38)

* Add localregistry input option

Option to add local registries to build process by specifying their url (https). Authentication to the repos  via user GitHub token.

* Backward compatible keyword syntax and Wrap new code in VERSION > 1.5

* Update Interface&README, add git_cli amd remove token flag

Provide multiple remotes separated with |
Add example to ReadMe
Support for private repos/packages with SSH protocol

* Update README.md

Co-authored-by: Sascha Mann <git@mail.saschamann.eu>

* Update action.yml

Co-authored-by: Sascha Mann <git@mail.saschamann.eu>

* Print warn mesasge if git_cli = true with Julia<1.7.

* Add `::notice::` formatting

---------

Co-authored-by: Sascha Mann <git@mail.saschamann.eu>

README.md

@@ -33,3 +33,39 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
 ```
+
+
+### Registry flavor preference
+
+This actions defines (and exports for subsequent steps of the workflow) the
+environmental variable `JULIA_PKG_SERVER_REGISTRY_PREFERENCE=eager` unless it
+is already set. If you want another registry flavor (i.e. `conservative`) this
+should be defined in the `env:` section of the relevant workflow or step. See
+[Registry flavors](https://pkgdocs.julialang.org/dev/registries/#Registry-flavors)
+for more information.
+
+### Adding Local Registries
+
+Personal registries, e.g. created with [LocalRegistry.jl](https://github.com/GunnarFarneback/LocalRegistry.jl), can be added to the CI using the `localregistry` input option. If the personal registry as well as packages needed in the current project are public, no additional setup is required if the registry url is specified in https-format.
+
+If the registry contains private packages, or is itself private, the ssh protocol should to be used. The user has to provide the corresponding private SSH-keys to the `ssh-agent` to access packages and registry. This can be conveniently done using the [webfactory/ssh-agent](https://github.com/webfactory/ssh-agent) action. A snippet illustrating the usage of (private) personal registries is shown below
+
+```yaml
+...   
+      # Adding private SSH keys (only necessary for accessing private packages and/or 
+      # when providing Registry-link in ssh format)
+      - uses: webfactory/ssh-agent@v0.8.0
+        with:
+          ssh-private-key: |
+            ${{ secrets.PRIVATE_DEPLOY_KEY }}
+            ${{ secrets.PRIVATE_DEPLOY_KEY2 }}
+      - uses: julia-actions/julia-buildpkg@v1
+        with:
+          localregistry: |
+            https://github.com/username/PersonalRegistry.git
+            git@github.com:username2/PersonalRegistry2.git
+          git_cli: false # = JULIA_PKG_USE_CLI_GIT. Options: true | false (default)
+...
+```
+
+For Julia 1.7 and above, the `git_cli` option can be used to set the `JULIA_PKG_USE_CLI_GIT` [environment flag](https://docs.julialang.org/en/v1/manual/environment-variables/), for additional control of the SSH configuration used by `Pkg` to add/dev packages.

action.yml

@@ -13,16 +13,47 @@ inputs:
   precompile:
     description: 'Whether to allow auto-precompilation (via the `JULIA_PKG_PRECOMPILE_AUTO` env var). Options: yes | no. Default value: no.'
     default: 'no'
+  localregistry:
+    description: 'Add local registries hosted on GitHub. Specified by providing the url (https/ssh) to the repositories as a newline (\n) seperated list.
+                  User is responsible for setting up the necessary SSH-Keys to access the repositories if necessary.'
+    default: ''
+  git_cli:
+    description: 'Determine if Pkg uses the cli git executable (Julia >= 1.7). Might be necessary for more complicated SSH setups.
+                  Options: true | false. Default : false'
+    default: 'false'
 
 runs:
   using: 'composite'
   steps:
+  - name: Set and export registry flavor preference
+    run: echo "JULIA_PKG_SERVER_REGISTRY_PREFERENCE=${JULIA_PKG_SERVER_REGISTRY_PREFERENCE:-eager}" >> ${GITHUB_ENV}
+    shell: bash
   - run: |
-      isfile("deps/build.jl") || exit()
       import Pkg
-      VERSION >= v"1.5-" && Pkg.Registry.add("General")
-      VERSION >= v"1.1.0-rc1" ? Pkg.build(verbose=true) : Pkg.build()
+      
+      # Determine if Pkg uses git-cli executable instead of LibGit2
+      VERSION >= v"1.7-" && (ENV["JULIA_PKG_USE_CLI_GIT"] = ${{ inputs.git_cli }})
+
+      if VERSION < v"1.7-" && ${{ inputs.git_cli }} == true
+        printstyled("::notice::JULIA_PKG_USE_CLI_GIT requires Julia >= 1.7. Using default LibGit2 git-interface instead! \n"; color = :yellow)
+      end
+
+
+      if VERSION >= v"1.5-"
+          Pkg.Registry.add("General")
+
+          # If provided add local registries
+          if !isempty("${{ inputs.localregistry }}")
+            local_repos = split("${{ inputs.localregistry }}", "\n") .|> string   
+            for repo_url in local_repos
+              isempty(repo_url) && continue
+              Pkg.Registry.add(Pkg.RegistrySpec(; url = repo_url))
+            end
+          end
+      end
+      
+      VERSION >= v"1.1.0-rc1" ? retry(Pkg.build)(verbose=true) : retry(Pkg.build)()
     shell: julia --color=yes --project=${{ inputs.project }} {0}
     env:
-      JULIA_PKG_SERVER_REGISTRY_PREFERENCE: "${{ env.JULIA_PKG_SERVER_REGISTRY_PREFERENCE == '' && 'eager' || env.JULIA_PKG_SERVER_REGISTRY_PREFERENCE }}"
       JULIA_PKG_PRECOMPILE_AUTO: "${{ inputs.precompile }}"
+      GITHUB_TOKEN: ${{ github.token }}