chore: standardize on a single naming scheme for releases

- "build" Dockerfiles should start with build-
- "release" scripts should have the name of the thing they are building appended

contrib/release-dokku

@@ -49,7 +49,7 @@ fn-build-dokku() {
     --build-arg IS_RELEASE="$IS_RELEASE" \
     --build-arg PLUGIN_MAKE_TARGET="build" \
     --build-arg GOLANG_VERSION="$GOLANG_VERSION" \
-    -f "contrib/build.Dockerfile" \
+    -f "contrib/build-dokku.Dockerfile" \
     -t "$NAME" .
   return "$?"
 }

contrib/release-dokku-update

@@ -32,7 +32,7 @@ fn-build-dokku() {
 
   pushd "$ROOT_DIR" >/dev/null
   docker build \
-    -f "contrib/update-build.Dockerfile" \
+    -f "contrib/build-dokku-update.Dockerfile" \
     -t dokku-update:build .
   return "$?"
 }

contrib/release-herokuish

@@ -32,7 +32,7 @@ fn-build-dokku() {
 
   pushd "$ROOT_DIR" >/dev/null
   docker build \
-    -f "contrib/herokuish-build.Dockerfile" \
+    -f "contrib/build-herokuish.Dockerfile" \
     -t herokuish:build .
   return "$?"
 }