Rearrange selfhosted VM scheduling.

Instead of trying to infer the type of the self hosted tests in each of
the driver scripts (inconsistently...), set one of the following
variables to "true" in the workflow:

VM: tests run in a virtual machine.
EPHEMERAL: tests run on an ephemeral virtual machine.
PERSISTENT: tests run on a persistent virtual machine
REMOTE: tests run on a physical remote host.

EPHEMERAL VMs can have multiple instances of any given VM can exist
simultaneously and are run by a runner pool.  The other types have a
dedicated runner instance and can only run a single test at a time.

Other settings:
SSHFS: We need to sshfs mount over the repo so the workflow can collect
	build artifacts.  This also implies the tests must be run over ssh.
DEBUG_ACTIONS: enable "set -x" in scripts for debugging.

.github/workflows/selfhosted.yml

@@ -11,9 +11,16 @@ jobs:
     runs-on: ${{ matrix.host }}
     timeout-minutes: 600
     env:
+      DEBUG_ACTIONS: false
       HOST: ${{ matrix.host }}
       TARGET_HOST: ${{ matrix.target }}
       TARGET_CONFIG: ${{ matrix.config }}
+      TARGET_DOMAIN: ${{ startsWith(matrix.host, 'libvirt') && format('{0}-{1}-{2}', matrix.target, matrix.config, github.run_id) || matrix.target }}
+      EPHEMERAL: ${{ startsWith(matrix.host, 'libvirt') }}
+      PERSISTENT: ${{ startsWith(matrix.host, 'persist') }}
+      REMOTE: ${{ startsWith(matrix.host, 'remote') }}
+      VM: ${{ startsWith(matrix.host, 'libvirt') || startsWith(matrix.host, 'persist') }}
+      SSHFS: ${{ startsWith(matrix.host, 'libvirt') || startsWith(matrix.host, 'persist') || startsWith(matrix.host, 'remote') }}
     strategy:
       fail-fast: false
       # We use a matrix in two parts: firstly all of the VMs are tested with the
@@ -75,34 +82,46 @@ jobs:
           - { target: nbsd8,  config: pam, host: libvirt }
           - { target: nbsd9,  config: pam, host: libvirt }
           - { target: nbsd10, config: pam, host: libvirt }
+          # ARM64 VMs
+          - { target: obsd-arm64, config: default, host: libvirt-arm64 }
           # VMs with persistent disks that have their own runner.
-          - { target: win10, config: default, host: win10 }
-          - { target: win10, config: cygwin-release, host: win10 }
-          # Physical hosts, with either native runners or remote via ssh.
+          - { target: win10, config: default,        host: persist-win10 }
+          - { target: win10, config: cygwin-release, host: persist-win10 }
+          # Physical hosts with native runners.
           - { target: ARM, config: default, host: ARM }
           - { target: ARM64, config: default, host: ARM64 }
           - { target: ARM64, config: pam, host: ARM64 }
-          - { target: debian-riscv64, config: default, host: debian-riscv64 }
-          - { target: obsd-arm64, config: default, host: obsd-arm64 }
-          - { target: openwrt-mips, config: default, host: openwrt-mips }
-          - { target: openwrt-mipsel, config: default, host: openwrt-mipsel }
+          # Physical hosts with remote runners.
+          - { target: debian-riscv64, config: default, host: remote-debian-riscv64 }
+
+          - { target: openwrt-mips, config: default, host: remote-openwrt-mips }
+          - { target: openwrt-mipsel, config: default, host: remote-openwrt-mipsel }
     steps:
-    - name: shutdown VM if running
-      run: vmshutdown
+    - name: unmount stale workspace
+      if: env.SSHFS == 'true'
+      run: fusermount -u ${GITHUB_WORKSPACE} || true
       working-directory: ${{ runner.temp }}
+    - name: shutdown VM if running
+      if: env.VM == 'true'
+      run: vmshutdown
     - uses: actions/checkout@main
     - name: autoreconf
       run: autoreconf
     - name: startup VM
+      if: env.VM == 'true'
       run: vmstartup
       working-directory: ${{ runner.temp }}
+    - name: copy and mount workspace
+      if: env.SSHFS == 'true'
+      run: sshfs_mount
+      working-directory: ${{ runner.temp }}
     - name: configure
       run: vmrun ./.github/configure.sh ${{ matrix.config }}
-    - name: save config
-      uses: actions/upload-artifact@main
-      with:
-        name: ${{ matrix.target }}-${{ matrix.config }}-config
-        path: config.h
+#    - name: save config
+#      uses: actions/upload-artifact@main
+#      with:
+#        name: ${{ matrix.target }}-${{ matrix.config }}-config
+#        path: config.h
     - name: make clean
       run: vmrun make clean
     - name: make
@@ -121,7 +140,10 @@ jobs:
           regress/*.log
           regress/log/*
           regress/valgrind-out/
-    - name: shutdown VM
-      if: always()
-      run: vmshutdown
+    - name: unmount workspace
+      if: always() && env.SSHFS == 'true'
+      run: fusermount -u ${GITHUB_WORKSPACE} || true
       working-directory: ${{ runner.temp }}
+    - name: shutdown VM
+      if: always() && env.VM == 'true'
+      run: vmshutdown

.github/workflows/upstream.yml

@@ -11,7 +11,9 @@ jobs:
     if: github.repository == 'openssh/openssh-portable-selfhosted'
     runs-on: 'libvirt'
     env:
+      DEBUG_ACTIONS: false
       HOST: 'libvirt'
+      EPHEMERAL: true
       TARGET_HOST: ${{ matrix.target }}
       TARGET_CONFIG: ${{ matrix.config }}
     strategy: