Add OCI image labels

dockerfiles/Dockerfile

@@ -1,4 +1,6 @@
-FROM --platform=$BUILDPLATFORM alpine:3.21.2 as alpine
+ARG BASE_IMAGE=alpine:3.21.2
+
+FROM --platform=$BUILDPLATFORM $BASE_IMAGE as alpine
 
 RUN apk add --no-cache \
     ca-certificates \
@@ -6,6 +8,13 @@ RUN apk add --no-cache \
 
 FROM scratch
 LABEL "com.centurylinklabs.watchtower"="true"
+LABEL "org.opencontainers.image.url"="https://nicholas-fedor.github.io/watchtower/" \
+      "org.opencontainers.image.documentation"="https://nicholas-fedor.github.io/watchtower/" \
+      "org.opencontainers.image.source"="https://github.com/nicholas-fedor/watchtower" \
+      "org.opencontainers.image.licenses"="Apache-2.0" \
+      "org.opencontainers.image.title"="Watchtower" \
+      "org.opencontainers.image.description"="A process for automating Docker container base image updates." \
+      "org.opencontainers.image.base.name"="$BASE_IMAGE"
 
 COPY --from=alpine \
     /etc/ssl/certs/ca-certificates.crt \

dockerfiles/Dockerfile.dev-self-contained

@@ -36,6 +36,13 @@ RUN \
 FROM scratch
 
 LABEL "com.centurylinklabs.watchtower"="true"
+LABEL "org.opencontainers.image.url"="https://nicholas-fedor.github.io/watchtower/" \
+      "org.opencontainers.image.documentation"="https://nicholas-fedor.github.io/watchtower/" \
+      "org.opencontainers.image.source"="https://github.com/nicholas-fedor/watchtower" \
+      "org.opencontainers.image.licenses"="Apache-2.0" \
+      "org.opencontainers.image.title"="Watchtower" \
+      "org.opencontainers.image.description"="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

@@ -10,11 +10,11 @@ build:
     - arm
     - arm64
   ldflags:
-    - -s -w -X github.com/nicholas-fedor/watchtower/internal/meta.Version={{.Version}}
+    - -s -w -X github.com/nicholas-fedor/watchtower/internal/meta.Version={{ .Version }}
 
 archives:
   - 
-    name_template: "{{.ProjectName}}_{{.Os}}_{{.Arch}}"
+    name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
     format: tar.gz
     replacements:
       arm: armhf
@@ -31,7 +31,11 @@ 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: ''
@@ -43,7 +47,11 @@ dockers:
       - ghcr.io/nicholas-fedor/watchtower:amd64-latest
   - 
     use_buildx: true
-    build_flag_templates: [ "--platform=linux/i386" ]
+    build_flag_templates:
+      - "--platform=linux/i386"
+      - "--label=org.opencontainers.image.created={{ .Date }}"
+      - "--label=org.opencontainers.image.version={{ .Version }}"
+      - "--label=org.opencontainers.image.revision={{ .FullCommit }}"
     goos: linux
     goarch: "386"
     goarm: ''
@@ -55,7 +63,11 @@ dockers:
       - ghcr.io/nicholas-fedor/watchtower:i386-latest
   - 
     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
@@ -67,7 +79,11 @@ dockers:
       - ghcr.io/nicholas-fedor/watchtower:armhf-latest
   - 
     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: ''