feat(v2): complete v2 reimplementation

tests/compose.ssh.yaml

@@ -0,0 +1,32 @@
+name: backup-tool-ssh-test
+
+services:
+  sshd:
+    build:
+      context: ./ssh-fixture
+      dockerfile: Dockerfile
+    read_only: true
+    tmpfs:
+      - /run/sshd:uid=0,gid=0,mode=0755,size=8m
+      - /tmp:mode=1777,size=8m
+    cap_drop:
+      - ALL
+    # sshd needs only these capabilities to chroot then drop to the SFTP account.
+    cap_add:
+      - SYS_CHROOT
+      - SETUID
+      - SETGID
+      - KILL
+    security_opt:
+      - no-new-privileges:true
+    ports:
+      - "127.0.0.1:${SSH_FIXTURE_PORT}:2222"
+    volumes:
+      - type: bind
+        source: ${SSH_FIXTURE_DIR}
+        target: /fixture
+        read_only: true
+      - type: bind
+        source: ${SSH_FIXTURE_DIR}/source
+        target: /home/backup/data
+        read_only: true