test(flagsmith): pin the testbed image, and follow the compose path convention

The compose file moves to src/test/resources/tck/docker-compose.yaml,
the path the TCK javadoc uses, and the image is pinned to 0.1.0 rather
than :latest.

Pinning is the substantive half. Four language adoptions pull this image,
and a mutable tag lets a push to the testbed change four pull requests'
results with no diff anywhere to explain it. The tag stays overridable
through FLAGSMITH_TESTBED_IMAGE.

56 scenarios: 24 pass, 12 fail, 20 skip. Unchanged.

Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>

Author: aepfli

providers/flagsmith/src/test/java/dev/openfeature/contrib/providers/flagsmith/FlagsmithProviderTckTest.java

@@ -40,7 +40,7 @@ public class FlagsmithProviderTckTest extends ContainerizedProviderTckTest {
 
     @Override
     public File composeFile() {
-        return new File("src/test/resources/flagsmith-testbed-compose.yaml");
+        return new File("src/test/resources/tck/docker-compose.yaml");
     }
 
     @Override

…resources/flagsmith-testbed-compose.yaml …c/test/resources/tck/docker-compose.yamlproviders/flagsmith/src/test/resources/flagsmith-testbed-compose.yaml renamed to providers/flagsmith/src/test/resources/tck/docker-compose.yaml providers/flagsmith/src/test/resources/flagsmith-testbed-compose.yaml renamed to providers/flagsmith/src/test/resources/tck/docker-compose.yaml

@@ -3,12 +3,15 @@
 #
 # The service is named "backend" because that is ContainerizedProviderTckTest's default.
 #
+# The image is PINNED, not :latest. Four language adoptions pull this image, and a mutable tag lets
+# a push to the testbed change four pull requests' results with no diff anywhere to explain it.
+#
 # Ports are never pinned. The TCK reads the dynamically mapped host ports after the stack is up,
 # and POST /stop deliberately never restarts the container precisely so those mappings survive an
 # outage scenario.
 services:
   backend:
-    image: ${FLAGSMITH_TESTBED_IMAGE:-ghcr.io/aepfli/flagsmith-tck-testbed:latest}
+    image: ${FLAGSMITH_TESTBED_IMAGE:-ghcr.io/aepfli/flagsmith-tck-testbed:0.1.0}
     ports:
       - 8000 # Edge Proxy -- what the provider under test talks to
       - 8080 # launchpad -- control API