Add QA test outputs, build scripts, and Dockerfile validation

- Created `qa-test-output-after-fix.txt` and `qa-test-output.txt` to log results of certificate page authentication tests.
- Added `build.sh` for deterministic backend builds in CI, utilizing `go list` for efficiency.
- Introduced `codeql_scan.sh` for CodeQL database creation and analysis for Go and JavaScript/TypeScript.
- Implemented `dockerfile_check.sh` to validate Dockerfiles for base image and package manager mismatches.
- Added `sourcery_precommit_wrapper.sh` to facilitate Sourcery CLI usage in pre-commit hooks.

backend/internal/api/handlers/testdata/fake_caddy.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo '{"apps":{}}'

backend/internal/api/handlers/testdata/fake_caddy_fail.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+if [ "$1" = "version" ]; then
+  echo "v2.0.0"
+  exit 0
+fi
+exit 1

backend/internal/api/handlers/testdata/fake_caddy_hosts.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+if [ "$1" = "version" ]; then
+  echo "v2.0.0"
+  exit 0
+fi
+if [ "$1" = "adapt" ]; then
+  # Read the domain from the input Caddyfile (stdin or --config file)
+  DOMAIN="example.com"
+  if [ "$2" = "--config" ]; then
+    DOMAIN=$(cat "$3" | head -1 | tr -d '\n')
+  fi
+  echo "{\"apps\":{\"http\":{\"servers\":{\"srv0\":{\"routes\":[{\"match\":[{\"host\":[\"$DOMAIN\"]}],\"handle\":[{\"handler\":\"reverse_proxy\",\"upstreams\":[{\"dial\":\"localhost:8080\"}]}]}]}}}}}"
+  exit 0
+fi
+exit 1