Add OCI Image Labels

dockerfiles/Dockerfile

@@ -6,6 +6,15 @@ RUN apk add --no-cache \
 
 FROM scratch
 LABEL "com.centurylinklabs.watchtower"="true"
+LABEL "org.opencontainers.image.url"="https://containrrr.dev/watchtower/" \
+      "org.opencontainers.image.documentation"="https://containrrr.dev/watchtower/" \
+      "org.opencontainers.image.source"="https://github.com/containrrr/watchtower" \
+      "org.opencontainers.image.licenses"="Apache-2.0" \
+# unsure about capitalization
+      "org.opencontainers.image.title"="watchtower" \
+      "org.opencontainers.image.title"="A process for automating Docker container base image updates." \
+# The version might be forgotten. The version could be extraced into a `ARG` before the initial `FROM` or removed.
+      "org.opencontainers.image.base.name"="alpine:3.19.0"
 
 COPY --from=alpine \
     /etc/ssl/certs/ca-certificates.crt \

dockerfiles/Dockerfile.self-contained

@@ -29,6 +29,13 @@ RUN \
 FROM scratch
 
 LABEL "com.centurylinklabs.watchtower"="true"
+LABEL "org.opencontainers.image.url"="https://containrrr.dev/watchtower/" \
+      "org.opencontainers.image.documentation"="https://containrrr.dev/watchtower/" \
+      "org.opencontainers.image.source"="https://github.com/containrrr/watchtower" \
+      "org.opencontainers.image.licenses"="Apache-2.0" \
+      "org.opencontainers.image.title"="watchtower" \
+      "org.opencontainers.image.title"="A process for automating Docker container base image updates." \
+      "org.opencontainers.image.base.name"="alpine"
 
 # copy files from other container
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

goreleaser.yml

@@ -30,7 +30,11 @@ archives:
 dockers:
   -
     use_buildx: true
-    build_flag_templates: [ "--platform=linux/amd64" ]
+    build_flag_templates:
+      - "--platform=linux/amd64"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
     goos: linux
     goarch: amd64
     goarm: ''
@@ -44,7 +48,11 @@ dockers:
       - watchtower
   - 
     use_buildx: true
-    build_flag_templates: [ "--platform=linux/386" ]
+    build_flag_templates:
+      - "--platform=linux/386"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
     goos: linux
     goarch: 386
     goarm: ''
@@ -58,7 +66,11 @@ dockers:
       - watchtower
   - 
     use_buildx: true
-    build_flag_templates: [ "--platform=linux/arm/v6" ]
+    build_flag_templates:
+      - "--platform=linux/arm/v6"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
     goos: linux
     goarch: arm
     goarm: 6
@@ -72,7 +84,11 @@ dockers:
       - watchtower
   - 
     use_buildx: true
-    build_flag_templates: [ "--platform=linux/arm64/v8" ]
+    build_flag_templates:
+      - "--platform=linux/arm64/v8"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
     goos: linux
     goarch: arm64
     goarm: ''