Zero downtime redeploys

When deploying check if there is already a container with the existing
name. If there is rename it to "<version>_<random_hex_string>" to remove
the name clash with the new container we want to boot.

We can then do the normal zero downtime run/wait/stop.

While implementing this I discovered the --filter name=foo does a
substring match for foo, so I've updated those filters to do an exact
match instead.

test/commands/healthcheck_test.rb

@@ -53,7 +53,7 @@ class CommandsHealthcheckTest < ActiveSupport::TestCase
 
   test "stop" do
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app --quiet | xargs docker stop",
+      "docker container ls --all --filter name=^healthcheck-app-123$ --quiet | xargs docker stop",
       new_command.stop.join(" ")
   end
 
@@ -61,13 +61,13 @@ class CommandsHealthcheckTest < ActiveSupport::TestCase
     @destination = "staging"
 
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app-staging --quiet | xargs docker stop",
+      "docker container ls --all --filter name=^healthcheck-app-staging-123$ --quiet | xargs docker stop",
       new_command.stop.join(" ")
   end
 
   test "remove" do
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app --quiet | xargs docker container rm",
+      "docker container ls --all --filter name=^healthcheck-app-123$ --quiet | xargs docker container rm",
       new_command.remove.join(" ")
   end
 
@@ -75,13 +75,13 @@ class CommandsHealthcheckTest < ActiveSupport::TestCase
     @destination = "staging"
 
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app-staging --quiet | xargs docker container rm",
+      "docker container ls --all --filter name=^healthcheck-app-staging-123$ --quiet | xargs docker container rm",
       new_command.remove.join(" ")
   end
 
   test "logs" do
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app --quiet | xargs docker logs --tail 50 2>&1",
+      "docker container ls --all --filter name=^healthcheck-app-123$ --quiet | xargs docker logs --tail 50 2>&1",
       new_command.logs.join(" ")
   end
 
@@ -89,7 +89,7 @@ class CommandsHealthcheckTest < ActiveSupport::TestCase
     @destination = "staging"
 
     assert_equal \
-      "docker container ls --all --filter name=healthcheck-app-staging --quiet | xargs docker logs --tail 50 2>&1",
+      "docker container ls --all --filter name=^healthcheck-app-staging-123$ --quiet | xargs docker logs --tail 50 2>&1",
       new_command.logs.join(" ")
   end