feat(ci): add GOPROXY and GODEBUG to avoid EOF errors

Configure GOPROXY with direct fallback and disable HTTP/2 client
to avoid transient EOF errors from proxy.golang.org on self-hosted
runners. Update workflow to use main branch of k8s-workflows.

Author: bschimke95

.github/workflows/pull_request.yaml

@@ -9,7 +9,7 @@ on:
 jobs:
   build-and-push-arch-specifics:
     name: Build Rocks and Push Arch Specific Images
-    uses: canonical/k8s-workflows/.github/workflows/build_rocks.yaml@KU-4668/go-build-issues
+    uses: canonical/k8s-workflows/.github/workflows/build_rocks.yaml@main
     with:
       owner: ${{ github.repository_owner }}
       trivy-image-config: "trivy.yaml"
@@ -19,7 +19,6 @@ jobs:
       platform-labels: '{"arm64": ["self-hosted", "Linux", "ARM64", "jammy"]}'
       enabled-ubuntu-pro-features: "fips-updates"
       rockcraft-revisions: '{"amd64": "3494", "arm64": "3547"}'
-      build-env: '{}'
     secrets:
       UBUNTU_PRO_TOKEN: ${{ secrets.UBUNTU_PRO_TOKEN }}
   run-tests:

0.7.1/rockcraft.yaml

@@ -38,6 +38,8 @@ parts:
       - build-essential
     build-snaps:
       - go/1.21-fips/stable
+    # Use GOPROXY with direct fallback and disable HTTP/2 to avoid transient EOF errors
+    # from proxy.golang.org on self-hosted runners
     build-environment:
       - GOPROXY: https://proxy.golang.org,direct
       - GODEBUG: http2client=0
@@ -47,4 +49,3 @@ parts:
       make build ARCH="${CRAFT_ARCH_BUILD_FOR}" BINARY_NAME=metrics-server
       cp $CRAFT_PART_BUILD/_output/metrics-server $CRAFT_PART_INSTALL
       snap refresh go --channel 1.23-fips/stable
-# Trigger build

0.7.2/rockcraft.yaml

@@ -38,6 +38,8 @@ parts:
       - build-essential
     build-snaps:
       - go/1.22-fips/stable
+    # Use GOPROXY with direct fallback and disable HTTP/2 to avoid transient EOF errors
+    # from proxy.golang.org on self-hosted runners
     build-environment:
       - GOPROXY: https://proxy.golang.org,direct
       - GODEBUG: http2client=0
@@ -47,4 +49,3 @@ parts:
       make build ARCH="${CRAFT_ARCH_BUILD_FOR}" BINARY_NAME=metrics-server
       cp $CRAFT_PART_BUILD/_output/metrics-server $CRAFT_PART_INSTALL
       snap refresh go --channel 1.23-fips/stable
-# Trigger build

0.8.0/rockcraft.yaml

@@ -38,6 +38,8 @@ parts:
       - build-essential
     build-snaps:
       - go/1.24-fips/stable
+    # Use GOPROXY with direct fallback and disable HTTP/2 to avoid transient EOF errors
+    # from proxy.golang.org on self-hosted runners
     build-environment:
       - GOPROXY: https://proxy.golang.org,direct
       - GODEBUG: http2client=0
@@ -51,4 +53,3 @@ parts:
       ls $CRAFT_PART_BUILD/_output
       cp $CRAFT_PART_BUILD/_output/metrics-server $CRAFT_PART_INSTALL
       snap refresh go --channel 1.23-fips/stable
-# Trigger build