CI: add 5.18 kernel

Signed-off-by: Robin Gögge <r.goegge@gmail.com>

.semaphore/semaphore.yml

@@ -42,7 +42,7 @@ blocks:
         - name: TMPDIR
           value: /tmp
         - name: CI_MAX_KERNEL_VERSION
-          value: "5.15"
+          value: "5.18"
       jobs:
       - name: Build and Lint
         commands:
@@ -61,10 +61,10 @@ blocks:
         commands:
           - sem-version go 1.17
           - go test -v ./cmd/bpf2go -run TestRun
-          - timeout -s KILL 600s ./run-tests.sh 5.10
+          - timeout -s KILL 600s ./run-tests.sh $CI_MAX_KERNEL_VERSION
       - name: Run unit tests
         matrix:
           - env_var: KERNEL_VERSION
-            values: ["5.15", "5.10", "5.4", "4.19", "4.14", "4.9"]
+            values: ["5.18", "5.15", "5.10", "5.4", "4.19", "4.14", "4.9"]
         commands:
           - timeout -s KILL 600s ./run-tests.sh $KERNEL_VERSION

README.md

@@ -30,15 +30,15 @@ have questions regarding the library.
 
 ## Packages
 
-This library includes the following packages: 
+This library includes the following packages:
 
 * [asm](https://pkg.go.dev/github.com/cilium/ebpf/asm) contains a basic
   assembler, allowing you to write eBPF assembly instructions directly
   within your Go code. (You don't need to use this if you prefer to write your eBPF program in C.)
 * [cmd/bpf2go](https://pkg.go.dev/github.com/cilium/ebpf/cmd/bpf2go) allows
   compiling and embedding eBPF programs written in C within Go code. As well as
   compiling the C code, it auto-generates Go code for loading and manipulating
-  the eBPF program and map objects. 
+  the eBPF program and map objects.
 * [link](https://pkg.go.dev/github.com/cilium/ebpf/link) allows attaching eBPF
   to various hooks
 * [perf](https://pkg.go.dev/github.com/cilium/ebpf/perf) allows reading from a