Jenkinsfile: remove redundant -f Dockerfile

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 64b3d12686e1a4ad4669e8c195cacafd76ea265c)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Jenkinsfile

@@ -382,7 +382,7 @@ pipeline {
                         stage("Build dev image") {
                             steps {
                                 sh '''
-                                docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} -f Dockerfile .
+                                docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} .
                                 '''
                             }
                         }
@@ -486,7 +486,7 @@ pipeline {
                         stage("Build dev image") {
                             steps {
                                 sh '''
-                                docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} -f Dockerfile .
+                                docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} .
                                 '''
                             }
                         }
@@ -567,7 +567,7 @@ pipeline {
                         }
                         stage("Build dev image") {
                             steps {
-                                sh 'docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} -f Dockerfile .'
+                                sh 'docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} .'
                             }
                         }
                         stage("Unit tests") {
@@ -669,7 +669,7 @@ pipeline {
                         }
                         stage("Build dev image") {
                             steps {
-                                sh 'docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} -f Dockerfile .'
+                                sh 'docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} .'
                             }
                         }
                         stage("Integration-cli tests") {