Add exact resumable HTTP source streaming

tests/kind/http-source-job.yaml.in

@@ -0,0 +1,21 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: @@JOB_NAME@@
+  namespace: remora-testbed
+spec:
+  activeDeadlineSeconds: 300
+  backoffLimit: 0
+  ttlSecondsAfterFinished: 300
+  template:
+    spec:
+      automountServiceAccountToken: false
+      enableServiceLinks: false
+      restartPolicy: Never
+      containers:
+        - name: tests
+          image: @@TEST_IMAGE@@
+          imagePullPolicy: Never
+          resources:
+            requests: {cpu: 100m, memory: 128Mi}
+            limits: {cpu: "1", memory: 512Mi}

tests/kind/run-http-source-job.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+source "$ROOT/tests/kind/lib.sh"
+
+USER_KUBECONFIG_BEFORE="$(user_kubeconfig_digest)"
+SUCCEEDED=false
+OWNS_FIXTURE=false
+
+cleanup() {
+  local status=$?
+  trap - EXIT INT TERM
+  if [[ "${REMORA_TESTBED_RETAIN:-0}" = 1 ]] && [[ "$SUCCEEDED" != true ]]; then
+    printf 'retained kubeconfig: %s\n' "$KUBECONFIG_PATH"
+    printf 'retained context: %s\n' "$CONTEXT"
+    exit "$status"
+  fi
+  if [[ "$OWNS_FIXTURE" = true ]]; then
+    destroy_fixture || status=1
+  fi
+  if [[ "$(user_kubeconfig_digest)" != "$USER_KUBECONFIG_BEFORE" ]]; then
+    printf 'user kubeconfig changed unexpectedly\n' >&2
+    status=1
+  fi
+  exit "$status"
+}
+
+trap cleanup EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+acquire_fixture_lock
+REMORA_REAL_NERDCTL="$(command -v nerdctl)"
+export REMORA_REAL_NERDCTL
+"$REMORA_REAL_NERDCTL" --namespace default build \
+  --file "$ROOT/Dockerfile.test" \
+  --target kind-http-source-runner \
+  --tag remora-kind-http-source:local \
+  "$ROOT"
+OWNS_FIXTURE=true
+setup_fixture base
+load_local_image remora-kind-http-source:local
+run_job_matrix \
+  http-source \
+  "$TESTBED/http-source-job.yaml.in" \
+  remora-kind-http-source:local \
+  base
+SUCCEEDED=true
+printf 'HTTP source adapter package test Job passed\n'