Temporarily downgrade Notary to Alpine 3.12

[tianon]

We need to build Notary 0.7.0 with an older version of Go, and Alpine 3.12 has an old enough version. There should be a new release of Notary soon which will fix the incompatibility and allow us to go back to Alpine 3.15.

See docker/notary-official-images#28

[github-actions]

Diff for ead6f06:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index e95bc57..998f75e 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -1,7 +1,7 @@
 Maintainers: Justin Cormack (@justincormack)
 Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
 GitRepo: https://github.com/docker/notary-official-images.git
-GitCommit: 297f548a568a8bcf8177c10e05165f11c9557dfc
+GitCommit: 16219dbe3c1433a6fc93e016cf421b230f681a2f
 
 Tags: server-0.7.0, server
 Directory: notary-server
diff --git a/notary_server/Dockerfile b/notary_server/Dockerfile
index 579c6d1..f0dab44 100644
--- a/notary_server/Dockerfile
+++ b/notary_server/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM alpine:3.12
 
 ENV TAG v0.7.0
 ENV NOTARYPKG github.com/theupdateframework/notary
@@ -16,7 +16,7 @@ RUN set -eux; \
     cp -vL ${GOPATH}/src/${NOTARYPKG}/bin/static/notary-server ./; \
     apk del --no-network build-deps; \
     rm -rf ${GOPATH}; \
-    ./notary-server --help
+    ./notary-server --version
 
 COPY ./server-config.json .
 COPY ./entrypoint.sh .
@@ -26,4 +26,4 @@ USER notary
 ENV PATH=$PATH:${INSTALLDIR}
 
 ENTRYPOINT [ "entrypoint.sh" ]
-CMD [ "notary-server", "--help" ]
+CMD [ "notary-server", "--version" ]
diff --git a/notary_signer/Dockerfile b/notary_signer/Dockerfile
index 74cf984..e2be5cb 100644
--- a/notary_signer/Dockerfile
+++ b/notary_signer/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM alpine:3.12
 
 ENV TAG v0.7.0
 ENV NOTARYPKG github.com/theupdateframework/notary
@@ -17,7 +17,7 @@ RUN set -eux; \
     cp -vL ${GOPATH}/src/${NOTARYPKG}/bin/static/notary-signer ./; \
     apk del --no-network build-deps; \
     rm -rf ${GOPATH}; \
-    ./notary-signer --help
+    ./notary-signer --version
 
 COPY ./signer-config.json .
 COPY ./entrypoint.sh .
@@ -27,4 +27,4 @@ USER notary
 ENV PATH=$PATH:${INSTALLDIR}
 
 ENTRYPOINT [ "entrypoint.sh" ]
-CMD [ "notary-signer", "--help" ]
+CMD [ "notary-signer", "--version" ]

Relevant Maintainers:

• notary: @justincormack