feat(mit-learn-nextjs): remove blue/green EFS deployment, scope Fastly purge

src/ol_concourse/pipelines/infrastructure/k8s_apps/pipeline.py

@@ -82,7 +82,14 @@ def set_repo_name(self) -> "AppPipelineParams":
     "mitxonline": AppPipelineParams(app_name="mitxonline", build_target="production"),
     "mit-learn-nextjs": AppPipelineParams(
         app_name="mit-learn-nextjs",
-        build_target="build_skip_yarn",
+        # No build_target: use the default `runner` stage, which bakes `yarn build`
+        # into the Docker image via `output: "standalone"` in next.config.js.
+        #
+        # NEXT_PUBLIC_* values are injected at runtime from Kubernetes env vars.
+        # Phase 3c Option A (per-env build args from Vault) OR Option B
+        # (next-runtime-env migration) must be completed before removing the
+        # Kubernetes build Job in __main__.py (Phase 3d). Until then, deploy
+        # Phase 3b and Phase 3d together as a single Pulumi update.
         repo_name="mit-learn",
         dockerfile_path="frontends/main/Dockerfile.web",
         purge_fastly_cache=True,
@@ -437,7 +444,10 @@ def build_app_pipeline(app_name: str) -> Pipeline:
                         path="sh",
                         args=[
                             "-exc",
-                            f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_ci))/purge_all" """,
+                            # Purge only HTML pages (tagged with surrogate key "html-pages").
+                            # /_next/static/ assets are content-addressed and immutable —
+                            # purging them causes missing-chunk errors during rolling deployments.
+                            f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_ci))/purge/html-pages" """,
                         ],
                     ),
                 ),
@@ -467,7 +477,10 @@ def build_app_pipeline(app_name: str) -> Pipeline:
                             path="sh",
                             args=[
                                 "-exc",
-                                f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_qa))/purge_all" """,
+                                # Purge only HTML pages (tagged with surrogate key "html-pages").
+                                # /_next/static/ assets are content-addressed and immutable —
+                                # purging them causes missing-chunk errors during rolling deployments.
+                                f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_qa))/purge/html-pages" """,
                             ],
                         ),
                     ),
@@ -486,7 +499,10 @@ def build_app_pipeline(app_name: str) -> Pipeline:
                             path="sh",
                             args=[
                                 "-exc",
-                                f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_production))/purge_all" """,
+                                # Purge only HTML pages (tagged with surrogate key "html-pages").
+                                # /_next/static/ assets are content-addressed and immutable —
+                                # purging them causes missing-chunk errors during rolling deployments.
+                                f"""curl -H "Fastly-Key: ((fastly.fastly_api_token))" -H "Accept: application/json" -i -X POST "https://api.fastly.com/service/((fastly.{pipeline_parameters.fastly_service_prefix}service_id_production))/purge/html-pages" """,
                             ],
                         ),
                     ),