github: adapt snap build job from main branch

Signed-off-by: Simon Deziel <[email protected]>

.github/workflows/test.yml

@@ -63,3 +63,58 @@ jobs:
         with:
           name: ${{ runner.os }}
           path: bin/
+
+  snap:
+    name: Trigger snap edge build
+    runs-on: ubuntu-22.04
+    needs: [test]
+    if: ${{ github.repository == 'canonical/lxd' && github.event_name == 'push' && github.actor != 'dependabot[bot]' }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Launchpad SSH access
+        env:
+          SSH_AUTH_SOCK: /tmp/ssh_agent.sock
+          LAUNCHPAD_LXD_BOT_KEY: ${{ secrets.LAUNCHPAD_LXD_BOT_KEY }}
+        run: |
+          set -eux
+          mkdir -m 0700 -p ~/.ssh/
+          ssh-agent -a "${SSH_AUTH_SOCK}" > /dev/null
+          ssh-add - <<< "${{ secrets.LAUNCHPAD_LXD_BOT_KEY }}"
+          ssh-add -L > ~/.ssh/id_ed25519.pub
+          # In ephemeral environments like GitHub Action runners, relying on TOFU isn't providing any security
+          # so require the key obtained by `ssh-keyscan` to match the expected hash from https://help.launchpad.net/SSHFingerprints
+          ssh-keyscan git.launchpad.net >> ~/.ssh/known_hosts
+          ssh-keygen -qlF git.launchpad.net | grep -xF 'git.launchpad.net RSA SHA256:UNOzlP66WpDuEo34Wgs8mewypV0UzqHLsIFoqwe8dYo'
+
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.22.x
+
+      - name: Trigger Launchpad snap build
+        env:
+          SSH_AUTH_SOCK: /tmp/ssh_agent.sock
+          TARGET: >-
+            ${{ fromJson('{
+              "main": "latest-edge",
+              "stable-4.0": "4.0-edge",
+            }')[github.ref_name] }}
+        run: |
+          set -eux
+          git config --global transfer.fsckobjects true
+          git config --global user.name "Canonical LXD Bot"
+          git config --global user.email "[email protected]"
+          git config --global commit.gpgsign true
+          git config --global gpg.format "ssh"
+          git config --global user.signingkey ~/.ssh/id_ed25519.pub
+          localRev="$(git rev-parse HEAD)"
+          go install github.com/canonical/lxd-ci/lxd-snapcraft@latest
+          git clone -b "${TARGET}" git+ssh://[email protected]/~canonical-lxd/lxd ~/lxd-pkg-snap-lp
+          cd ~/lxd-pkg-snap-lp
+          lxd-snapcraft -package lxd -set-version "git-${localRev:0:7}" -set-source-commit "${localRev}"
+          git add --all
+          git commit --all --quiet -s --allow-empty -m "Automatic upstream build (${TARGET})" -m "Upstream commit: ${localRev}"
+          git show
+          git push --quiet