image:tag@digest format support

test/dockerfile2/diun.yml

@@ -0,0 +1,15 @@
+watch:
+  workers: 20
+  schedule: "0 */6 * * *"
+  firstCheckNotif: true
+
+notif:
+  script:
+    cmd: "sh"
+    args:
+      - "/mount/notif.sh"
+
+providers:
+  dockerfile:
+    patterns:
+      - /mount/Dockerfile

test/dockerfile2/mount/Dockerfile

@@ -0,0 +1,16 @@
+# syntax=docker/dockerfile:1
+
+# diun.platform=linux/amd64
+FROM alpine:latest
+
+# diun.platform=linux/amd64
+# diun.metadata.foo=bar
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=bind,from=crazymax/undock:0.5.0@sha256:736fdfde1268b93c2f733c53a7c45ece24e275318628fbb790bee7f89459961f,source=/usr/local/bin/undock,target=/usr/local/bin/undock \
+  undock --version
+
+# diun.platform=linux/amd64
+# diun.metadata.foo=bar
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=bind,from=crazymax/ddns-route53:foo@sha256:9cb3af44cdd00615266c87e60bc05cac534297be14c4596800b57322f9313615,source=/usr/local/bin/ddns-route53,target=/usr/local/bin/ddns-route53 \
+  ddns-route53 --version

test/dockerfile2/mount/notif.sh

@@ -0,0 +1 @@
+env|sort