bazel: Switch to envoy fork (#268)

* bazel: Switch to envoy fork

* bazel: Updated hash

* bazel: Updated comments

* bazel: Update comment for correctness

bazel/repository_locations.bzl

@@ -1,8 +1,10 @@
 REPOSITORY_LOCATIONS = dict(
     envoy = dict(
-        # envoy 1.26.4
-        commit = "cfa32deca25ac57c2bbecdad72807a9b13493fc1",
-        remote = "https://github.com/envoyproxy/envoy",
+        # envoy 1.26.4 forked with extproc changes
+        # sourced from release/v1.26-backportedfork
+        # should go back to upstream once 1.28or wherever the associated prs are merged
+        commit = "f854df5872c0a632774a78537a63d0f6ec4b370b",
+        remote = "https://github.com/solo-io/envoy-fork",
     ),
     inja = dict(
         # Includes unmerged modifications for

changelog/v1.26.4-patch2/envoy-fork.yaml

@@ -0,0 +1,9 @@
+changelog:
+  - type: DEPENDENCY_BUMP
+    dependencyRepo: envoy-fork
+    dependencyOwner: solo-io
+    dependencyTag: v1.26.4
+    description: >
+      Migrate to fork that is based off of 1.26.4. It includes long term backports.
+      These backports are not fully merged upstream but make external processing actually function as needed.
+      Notably this implements several long time api notes that were never implemeented before.