Add image source label to dockerfiles (#456)

* Update Dockerfile.custom

* Update Dockerfile.debian

* Update Dockerfile.alpine

* Update Dockerfile.debian

Author: wuast94

.docker/Dockerfile.alpine

@@ -71,6 +71,7 @@ LABEL org.label-schema.build-date=${BUILD_DATE} \
     org.label-schema.vcs-ref=${BUILD_REF} \
     org.label-schema.vcs-type="Git" \
     org.label-schema.vcs-url="https://github.com/node-red/node-red-docker" \
+    org.opencontainers.image.source="https://github.com/node-red/node-red-docker" \
     org.label-schema.arch=${ARCH} \
     authors="Dave Conway-Jones, Nick O'Leary, James Thomas, Raymond Mouthaan"
 

.docker/Dockerfile.debian

@@ -71,6 +71,7 @@ LABEL org.label-schema.build-date=${BUILD_DATE} \
     org.label-schema.vcs-ref=${BUILD_REF} \
     org.label-schema.vcs-type="Git" \
     org.label-schema.vcs-url="https://github.com/node-red/node-red-docker" \
+    org.opencontainers.image.source="https://github.com/node-red/node-red-docker" \
     org.label-schema.arch=${ARCH} \
     authors="Dave Conway-Jones, Nick O'Leary, James Thomas, Raymond Mouthaan"
 

docker-custom/Dockerfile.custom

@@ -70,6 +70,7 @@ LABEL org.label-schema.build-date=${BUILD_DATE} \
     org.label-schema.vcs-ref=${BUILD_REF} \
     org.label-schema.vcs-type="Git" \
     org.label-schema.vcs-url="https://github.com/node-red/node-red-docker" \
+    org.opencontainers.image.source="https://github.com/node-red/node-red-docker" \
     org.label-schema.arch=${ARCH} \
     authors="Dave Conway-Jones, Nick O'Leary, James Thomas, Raymond Mouthaan"
 

docker-custom/Dockerfile.debian

@@ -72,6 +72,7 @@ LABEL org.label-schema.build-date=${BUILD_DATE} \
     org.label-schema.vcs-ref=${BUILD_REF} \
     org.label-schema.vcs-type="Git" \
     org.label-schema.vcs-url="https://github.com/node-red/node-red-docker" \
+    org.opencontainers.image.source="https://github.com/node-red/node-red-docker" \
     org.label-schema.arch=${ARCH} \
     authors="Dave Conway-Jones, Nick O'Leary, James Thomas, Raymond Mouthaan"