fix: add missing build dependencies for cryptography (#20)

.drone.jsonnet

@@ -186,9 +186,11 @@ local PipelineBuildContainer(arch='amd64') = {
   steps: [
     {
       name: 'build',
-      image: 'python:3.9',
+      image: 'python:3.9-alpine',
       commands: [
+        'apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git',
         'git fetch -tq',
+        'pip install --upgrade --no-cache-dir pip',
         'pip install poetry poetry-dynamic-versioning -qq',
         'poetry build',
       ],

.drone.yml

@@ -202,9 +202,11 @@ platform:
 
 steps:
 - name: build
-  image: python:3.9
+  image: python:3.9-alpine
   commands:
+  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
   - git fetch -tq
+  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
 
@@ -280,9 +282,11 @@ platform:
 
 steps:
 - name: build
-  image: python:3.9
+  image: python:3.9-alpine
   commands:
+  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
   - git fetch -tq
+  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
 
@@ -358,9 +362,11 @@ platform:
 
 steps:
 - name: build
-  image: python:3.9
+  image: python:3.9-alpine
   commands:
+  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
   - git fetch -tq
+  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
 
@@ -523,6 +529,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 57dfcfa9104a9a810920a01f5de8a8dd9576de80bbdc136c3b3950b3a7298862
+hmac: 6c2f2b96724c5f5ae068e58f9474c300006d7547402ff31985b288e37670ceff
 
 ...