Start ssh agent.

task/buildkit-rootless-daemonless/0.1/buildkit-rootless-daemonless.yaml

@@ -73,6 +73,15 @@ spec:
         tee /home/user/.config/buildkit/buildkitd.toml <<EOF
         $(params.BUILDKITD_TOML)
         EOF
+        cat > /home/user/.config/buildkit/entrypoint.sh <<EOF
+        #!/usr/bin/env sh
+        #
+        set -euo pipefail
+        eval \$(ssh-agent)
+        ssh-add /tekton/creds/.ssh/id_*
+        exec buildctl-daemonless.sh build --ssh default=\$SSH_AUTH_SOCK "\${@}"
+        EOF
+        chmod +x /home/user/.config/buildkit/entrypoint.sh
       volumeMounts:
         - name: buildkitd
           mountPath: /home/user/.local/share/buildkit
@@ -85,9 +94,8 @@ spec:
     - name: build-and-push
       image: $(params.BUILDER_IMAGE)
       workingDir: "$(workspaces.source.path)"
-      command: ["buildctl-daemonless.sh"]
+      command: ["/home/user/.config/buildkit/entrypoint.sh"]
       args:
-        - build
         - --frontend
         - dockerfile.v0
         - --local