Updated to jenkins and gitea (#4)

Co-authored-by: Mutzi <root@mattv.de>
Reviewed-on: #4

Jenkinsfile

@@ -0,0 +1,20 @@
+pipeline {
+    agent none
+    stages {
+        stage('Build') {
+            agent {
+                docker { image 'rust:alpine' }
+            }
+            environment {
+                RUSTFLAGS = '-C target-feature=+crt-static -C link-self-contained=yes -C link-arg=-s'
+                TOKEN = credentials('abd7020c-43d6-485b-ae09-2f9b484d9c15')
+            }
+            steps {
+                sh 'apk add pkgconf musl-dev curl'
+                sh 'cargo build --release --target x86_64-unknown-linux-musl'
+                sh 'cp target/x86_64-unknown-linux-musl/release/dotfiles_installer ./installer-amd64'
+                sh 'curl -H "Authorization: token ${TOKEN_PSW}" --upload-file ./installer-amd64 https://gitea.mattv.de/api/packages/root/generic/installer/${GIT_COMMIT}/installer-amd64'
+            }
+        }
+    }
+}