reduce to one dockerfile as they have the exact same content

Dockerfile

@@ -0,0 +1,18 @@
+FROM alpine:latest as alpine
+
+RUN apk add --no-cache \
+    ca-certificates \
+    tzdata
+
+FROM scratch
+LABEL "com.centurylinklabs.watchtower"="true"
+
+COPY --from=alpine \
+    /etc/ssl/certs/ca-certificates.crt \
+    /etc/ssl/certs/ca-certificates.crt
+COPY --from=alpine \
+    /usr/share/zoneinfo \
+    /usr/share/zoneinfo
+
+COPY watchtower /
+ENTRYPOINT ["/watchtower"]

dockerfile/amd64/Dockerfile

@@ -1,13 +0,0 @@
-FROM alpine:latest as alpine
-RUN apk add --no-cache \
-    ca-certificates \
-    tzdata
-
-FROM scratch
-LABEL "com.centurylinklabs.watchtower"="true"
-
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
-
-COPY watchtower /
-ENTRYPOINT ["/watchtower"]

dockerfile/arm64v8/Dockerfile

@@ -1,13 +0,0 @@
-FROM alpine:latest as alpine
-RUN apk add --no-cache \
-    ca-certificates \
-    tzdata
-
-FROM scratch
-LABEL "com.centurylinklabs.watchtower"="true"
-
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
-
-COPY watchtower /
-ENTRYPOINT ["/watchtower"]

dockerfile/armhf/Dockerfile

@@ -1,13 +0,0 @@
-FROM alpine:latest as alpine
-RUN apk add --no-cache \
-    ca-certificates \
-    tzdata
-
-FROM scratch
-LABEL "com.centurylinklabs.watchtower"="true"
-
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
-
-COPY watchtower /
-ENTRYPOINT ["/watchtower"]

dockerfile/i386/Dockerfile

@@ -1,13 +0,0 @@
-FROM alpine:latest as alpine
-RUN apk add --no-cache \
-    ca-certificates \
-    tzdata
-
-FROM scratch
-LABEL "com.centurylinklabs.watchtower"="true"
-
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
-
-COPY watchtower /
-ENTRYPOINT ["/watchtower"]

goreleaser.yml

@@ -29,9 +29,7 @@ dockers:
     goos: linux
     goarch: amd64
     goarm: ''
-    dockerfile: dockerfile/amd64/Dockerfile
-    build_flag_templates:
-      - "--label=com.centurylinklabs.watchtower=true"
+    dockerfile: Dockerfile
     image_templates:
       - containrrr/watchtower:{{ .Version }}
     binaries:
@@ -40,9 +38,7 @@ dockers:
     goos: linux
     goarch: 386
     goarm: ''
-    dockerfile: dockerfile/i386/Dockerfile
-    build_flag_templates:
-      - "--label=com.centurylinklabs.watchtower=true"
+    dockerfile: Dockerfile
     image_templates:
       - containrrr/watchtower:i386-{{ .Version }}
     binaries:
@@ -51,9 +47,7 @@ dockers:
     goos: linux
     goarch: arm
     goarm: 6
-    dockerfile: dockerfile/armhf/Dockerfile
-    build_flag_templates:
-      - "--label=com.centurylinklabs.watchtower=true"
+    dockerfile: Dockerfile
     image_templates:
       - containrrr/watchtower:armhf-{{ .Version }}
     binaries:
@@ -62,9 +56,7 @@ dockers:
     goos: linux
     goarch: arm64
     goarm: ''
-    dockerfile: dockerfile/arm64v8/Dockerfile
-    build_flag_templates:
-      - "--label=com.centurylinklabs.watchtower=true"
+    dockerfile: Dockerfile
     image_templates:
       - containrrr/watchtower:arm64v8-{{ .Version }}
     binaries: