Support running Actions on a fork

Since 8c9450e7b8, we increased the chance
to run GitHub Actions on a fork, as we usually use a topic branch
instead of master when filing a pull request.

This patch makes it possible to reuse the same GitHub Actions config on
a fork repository.

.github/workflows/cygwin.yml

@@ -42,9 +42,9 @@ jobs:
         run: |
           echo '::set-env name=PATH::C:\tools\cygwin\bin;C:\tools\cygwin\usr\bin'
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard ${{ github.sha }}
         if: github.event_name == 'push'
         shell: cmd

.github/workflows/macos.yml

@@ -20,9 +20,9 @@ jobs:
           sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate off
           sudo /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard "$GITHUB_SHA"
         if: github.event_name == 'push'
       - name: Checkout a pull request

.github/workflows/mingw.yml

@@ -37,9 +37,9 @@ jobs:
           git config --system core.autocrlf false
           git config --system core.eol lf
       # Not using official actions/checkout@v2 because it's unstable.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard "$GITHUB_SHA"
         if: github.event_name == 'push'
       - name: Checkout a pull request

.github/workflows/mjit.yml

@@ -22,9 +22,9 @@ jobs:
           sudo apt-get update -q || :
           sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev bison autoconf ruby
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard "$GITHUB_SHA"
         if: github.event_name == 'push'
       - name: Checkout a pull request

.github/workflows/ubuntu.yml

@@ -53,9 +53,9 @@ jobs:
           sudo apt-get update -q || :
           sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev bison autoconf ruby
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard "$GITHUB_SHA"
         if: github.event_name == 'push'
       - name: Checkout a pull request

.github/workflows/windows.yml

@@ -38,9 +38,9 @@ jobs:
         run: |
           choco install --no-progress openssl winflexbison3
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-      - name: Checkout ruby/ruby
+      - name: Checkout push to ruby
         run: |
-          git clone --single-branch --shallow-since=yesterday https://github.com/ruby/ruby src
+          git clone --single-branch --shallow-since=yesterday https://github.com/${{ github.repository }} src
           git -C src reset --hard ${{ github.sha }}
         if: github.event_name == 'push'
       - name: Checkout a pull request