Add caddy server static PIE build

Signed-off-by: Tom Boettger <[email protected]>

consul/.gitignore

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+/consul-*
+/v1.*.zip

consul/GNUmakefile.patch

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+202c202,203
+< 	CGO_ENABLED=0 GOOS=linux GOARCH=$(GOARCH) go build -o ./pkg/bin/linux_$(GOARCH) -ldflags "$(GOLDFLAGS)" -tags "$(GOTAGS)"
+---
+> 	GOLDFLAGS="$(GOLDFLAGS) -linkmode external -extldflags '-static-pie'"
+> 	CGO_ENABLED=0 GOOS=linux GOARCH=$(GOARCH) go build -o ./pkg/bin -buildmode=pie -ldflags "$(GOLDFLAGS)" -tags "$(GOTAGS)"

consul/README.md

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+# Build consul server as static PIE
+
+Build the consul server as a static PIE ELF running on Linux.
+
+## Requirements
+
+Make sure the following packages are installed:
+* go >= 1.17
+* unzip
+* patch
+
+## Build
+
+The `consul` static PIE ELF is located in the current folder.
+If you want to rebuild it, run:
+
+```
+$ ./build.sh
+```
+
+## Run
+
+You can run the executable natively on Linux:
+
+```
+$ ./consul-1.13.3/pkg/bin/consul version
+```
+
+Or with [run-elfloader](https://github.com/unikraft/run-app-elfloader) on Unikraft:
+```
+$ ./run_elfloader ../static-pie-apps/consul/consul-1.13.3/pkg/bin/consul [args]
+```

consul/build.sh

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+#!/bin/sh
+
+# Clean up
+rm -rf consul-*
+rm -f v1.*
+
+echo "Downloading consul source code... "
+wget -q https://github.com/hashicorp/consul/archive/refs/tags/v1.13.3.zip
+
+echo "Unpacking consul source code..."
+unzip v1.13.3.zip
+
+echo "Building consul... "
+cd consul-1.13.3 || exit
+patch GNUmakefile ../GNUmakefile.patch
+make linux
+echo ""