DEBUG with tmate

Need to do this manually; Using `mxschmitt/action-tmate` would launch
the tmate session in C:\msys64 instead, which would prevent effective
debugging in the Git for Windows SDK.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/update-pacman.yml

@@ -25,6 +25,28 @@ jobs:
           token: ${{ secrets.PUSH_TOKEN }}
       - name: use git-sdk-arm64's Bash and Git for Windows' git.exe
         run: "usr\\bin\\bash.exe -lc 'cygpath -aw /usr/bin >>$GITHUB_PATH && cygpath -aw /c/Program\ Files/Git/cmd/ >>$GITHUB_PATH'"
+      - name: Run tmate
+        shell: bash
+        run: |
+          # install tmate
+          pacman -Sy --noconfirm tmate openssh &&
+
+          # restrict SSH access to the "actor", i.e. the GitHub user who triggered this workflow
+          # this requires calling `ssh -i <private-key> [...]` later on
+          mkdir -p ~/.ssh &&
+          curl -H 'Authorization: token ${{ github.token }}' \
+            https://api.github.com/users/${{github.actor}}/keys |
+          jq -r '.[].key' >~/.ssh/authorized_keys &&
+
+          # Generate an SSH key (needed for tmate)
+          echo -e 'y\n' | ssh-keygen -q -t rsa -N '' -f ~/.ssh/id_rsa &&
+
+          # Start tmate session
+          export CHERE_INVOKING=1 &&
+          tmate -S /tmp/tmate.sock -a ~/.ssh/authorized_keys new-session -d &&
+          tmate -S /tmp/tmate.sock wait tmate-ready &&
+
+          tmate -S /tmp/tmate.sock display -p '#{tmate_ssh}'
       - name: download Pacman package
         id: download
         shell: bash
@@ -60,3 +82,13 @@ jobs:
             -m 'It has been overridden with a version that does not deadlock on Windows/ARM64' \
             etc/pacman.conf &&
           git push origin HEAD
+      - name: wait for tmate to be done
+        if: always()
+        shell: bash
+        run: |
+          PATH=$HOME/bin:$PATH
+          while test -e /tmp/tmate.sock
+          do
+            tmate -S /tmp/tmate.sock display -p '#{tmate_ssh}'
+            sleep 5
+          done